Update Gopkg.lock

The --explain option instructs restic to print the reason for keeping
each snapshot.

Gopkg.lock

@@ -69,7 +69,7 @@
 
 [[projects]]
   name = "github.com/google/go-cmp"
-  packages = ["cmp","cmp/internal/diff","cmp/internal/function","cmp/internal/value"]
+  packages = ["cmp","cmp/cmpopts","cmp/internal/diff","cmp/internal/function","cmp/internal/value"]
   revision = "8099a9787ce5dc5984ed879a3bda47dc730a8e97"
   version = "v0.1.0"
 
@@ -250,6 +250,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "a5de339cba7570216b212439b90e1e6c384c94be8342fe7755b7cb66aa0a3440"
+  inputs-digest = "0872d779dc7d512aef3f6e4d97208c153c27da7b00f51387e14827515c70d660"
   solver-name = "gps-cdcl"
   solver-version = 1

cmd/restic/cmd_forget.go

@@ -40,6 +40,7 @@ type ForgetOptions struct {
 	Tags    restic.TagLists
 	Paths   []string
 	Compact bool
+	Explain bool
 
 	// Grouping
 	GroupBy string
@@ -73,6 +74,7 @@ func init() {
 	f.StringVarP(&forgetOptions.GroupBy, "group-by", "g", "host,paths", "string for grouping snapshots by host,paths,tags")
 	f.BoolVarP(&forgetOptions.DryRun, "dry-run", "n", false, "do not delete anything, just print what would be done")
 	f.BoolVar(&forgetOptions.Prune, "prune", false, "automatically run the 'prune' command if snapshots have been removed")
+	f.BoolVar(&forgetOptions.Explain, "explain", false, "show reason why a particular snapshot was kept")
 
 	f.SortFlags = false
 }
@@ -206,17 +208,17 @@ func runForget(opts ForgetOptions, gopts GlobalOptions, args []string) error {
 			}
 			Verbosef(":\n\n")
 
-			keep, remove := restic.ApplyPolicy(snapshotGroup, policy)
+			keep, remove, reasons := restic.ApplyPolicy(snapshotGroup, policy)
 
 			if len(keep) != 0 && !gopts.Quiet {
 				Printf("keep %d snapshots:\n", len(keep))
-				PrintSnapshots(globalOptions.stdout, keep, opts.Compact)
+				PrintSnapshots(globalOptions.stdout, keep, reasons, opts.Compact)
 				Printf("\n")
 			}
 
 			if len(remove) != 0 && !gopts.Quiet {
 				Printf("remove %d snapshots:\n", len(remove))
-				PrintSnapshots(globalOptions.stdout, remove, opts.Compact)
+				PrintSnapshots(globalOptions.stdout, remove, nil, opts.Compact)
 				Printf("\n")
 			}
 

cmd/restic/cmd_snapshots.go

@@ -81,7 +81,7 @@ func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) erro
 		}
 		return nil
 	}
-	PrintSnapshots(gopts.stdout, list, opts.Compact)
+	PrintSnapshots(gopts.stdout, list, nil, opts.Compact)
 
 	return nil
 }
@@ -123,7 +123,7 @@ func FilterLastSnapshots(list restic.Snapshots) restic.Snapshots {
 }
 
 // PrintSnapshots prints a text table of the snapshots in list to stdout.
-func PrintSnapshots(stdout io.Writer, list restic.Snapshots, compact bool) {
+func PrintSnapshots(stdout io.Writer, list restic.Snapshots, reasons []restic.KeepReason, compact bool) {
 
 	// always sort the snapshots so that the newer ones are listed last
 	sort.SliceStable(list, func(i, j int) bool {
@@ -152,7 +152,7 @@ func PrintSnapshots(stdout io.Writer, list restic.Snapshots, compact bool) {
 		tab.RowFormat = fmt.Sprintf("%%-8s  %%-19s  %%%ds  %%s", -maxHost)
 	}
 
-	for _, sn := range list {
+	for i, sn := range list {
 		if len(sn.Paths) == 0 {
 			continue
 		}
@@ -205,6 +205,18 @@ func PrintSnapshots(stdout io.Writer, list restic.Snapshots, compact bool) {
 
 			tab.Rows = append(tab.Rows, []interface{}{"", "", "", tag, treeElement, path})
 		}
+
+		// add the reasons to keep this snapshot
+		if !compact && len(reasons) > 0 {
+			reason := reasons[i]
+			for _, match := range reason.Matches {
+				s := fmt.Sprintf("          %v", match)
+				tab.Rows = append(tab.Rows, []interface{}{"", s, "", "", "", ""})
+			}
+			if len(reason.Matches) > 0 {
+				tab.Rows = append(tab.Rows, []interface{}{"", "", "", "", "", ""})
+			}
+		}
 	}
 
 	tab.Footer = fmt.Sprintf("%d snapshots", len(list))

internal/restic/snapshot_policy.go

@@ -6,6 +6,8 @@ import (
 	"sort"
 	"strings"
 	"time"
+
+	"github.com/restic/restic/internal/debug"
 )
 
 // ExpirePolicy configures which snapshots should be automatically removed.
@@ -125,41 +127,70 @@ func findLatestTimestamp(list Snapshots) time.Time {
 	return latest
 }
 
+// KeepReason specifies why a particular snapshot was kept, and the counters at
+// that point in the policy evaluation.
+type KeepReason struct {
+	Snapshot *Snapshot `json:"snapshot"`
+
+	// description text which criteria match, e.g. "daily", "monthly"
+	Matches []string `json:"matches"`
+
+	// the counters after evaluating the current snapshot
+	Counters struct {
+		Last    int `json:"last,omitempty"`
+		Hourly  int `json:"hourly,omitempty"`
+		Daily   int `json:"daily,omitempty"`
+		Weekly  int `json:"weekly,omitempty"`
+		Monthly int `json:"monthly,omitempty"`
+		Yearly  int `json:"yearly,omitempty"`
+	} `json:"counters"`
+}
+
 // ApplyPolicy returns the snapshots from list that are to be kept and removed
-// according to the policy p. list is sorted in the process.
-func ApplyPolicy(list Snapshots, p ExpirePolicy) (keep, remove Snapshots) {
+// according to the policy p. list is sorted in the process. reasons contains
+// the reasons to keep each snapshot, it is in the same order as keep.
+func ApplyPolicy(list Snapshots, p ExpirePolicy) (keep, remove Snapshots, reasons []KeepReason) {
 	sort.Sort(list)
 
 	if p.Empty() {
-		return list, remove
+		for _, sn := range list {
+			reasons = append(reasons, KeepReason{
+				Snapshot: sn,
+				Matches:  []string{"policy is empty"},
+			})
+		}
+		return list, remove, reasons
 	}
 
 	if len(list) == 0 {
-		return list, remove
+		return list, nil, nil
 	}
 
 	var buckets = [6]struct {
 		Count  int
 		bucker func(d time.Time, nr int) int
 		Last   int
+		reason string
 	}{
-		{p.Last, always, -1},
-		{p.Hourly, ymdh, -1},
-		{p.Daily, ymd, -1},
-		{p.Weekly, yw, -1},
-		{p.Monthly, ym, -1},
-		{p.Yearly, y, -1},
+		{p.Last, always, -1, "last snapshot"},
+		{p.Hourly, ymdh, -1, "hourly snapshot"},
+		{p.Daily, ymd, -1, "daily snapshot"},
+		{p.Weekly, yw, -1, "weekly snapshot"},
+		{p.Monthly, ym, -1, "monthly snapshot"},
+		{p.Yearly, y, -1, "yearly snapshot"},
 	}
 
 	latest := findLatestTimestamp(list)
 
 	for nr, cur := range list {
 		var keepSnap bool
+		var keepSnapReasons []string
 
 		// Tags are handled specially as they are not counted.
 		for _, l := range p.Tags {
 			if cur.HasTags(l) {
 				keepSnap = true
+				keepSnapReasons = append(keepSnapReasons, fmt.Sprintf("has tags %v", l))
 			}
 		}
 
@@ -168,6 +199,7 @@ func ApplyPolicy(list Snapshots, p ExpirePolicy) (keep, remove Snapshots) {
 			t := latest.AddDate(-p.Within.Years, -p.Within.Months, -p.Within.Days)
 			if cur.Time.After(t) {
 				keepSnap = true
+				keepSnapReasons = append(keepSnapReasons, fmt.Sprintf("within %v", p.Within))
 			}
 		}
 
@@ -176,19 +208,32 @@ func ApplyPolicy(list Snapshots, p ExpirePolicy) (keep, remove Snapshots) {
 			if b.Count > 0 {
 				val := b.bucker(cur.Time, nr)
 				if val != b.Last {
+					debug.Log("keep %v %v, bucker %v, val %v\n", cur.Time, cur.id.Str(), i, val)
 					keepSnap = true
 					buckets[i].Last = val
 					buckets[i].Count--
+					keepSnapReasons = append(keepSnapReasons, b.reason)
 				}
 			}
 		}
 
 		if keepSnap {
 			keep = append(keep, cur)
+			kr := KeepReason{
+				Snapshot: cur,
+				Matches:  keepSnapReasons,
+			}
+			kr.Counters.Last = buckets[0].Count
+			kr.Counters.Hourly = buckets[1].Count
+			kr.Counters.Daily = buckets[2].Count
+			kr.Counters.Weekly = buckets[3].Count
+			kr.Counters.Monthly = buckets[4].Count
+			kr.Counters.Yearly = buckets[5].Count
+			reasons = append(reasons, kr)
 		} else {
 			remove = append(remove, cur)
 		}
 	}
 
-	return keep, remove
+	return keep, remove, reasons
 }

internal/restic/snapshot_policy_test.go

@@ -5,10 +5,11 @@ import (
 	"fmt"
 	"io/ioutil"
 	"path/filepath"
-	"reflect"
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/restic/restic/internal/restic"
 )
 
@@ -52,6 +53,43 @@ func TestExpireSnapshotOps(t *testing.T) {
 	}
 }
 
+// ApplyPolicyResult is used to marshal/unmarshal the golden files for
+// TestApplyPolicy.
+type ApplyPolicyResult struct {
+	Keep    restic.Snapshots    `json:"keep"`
+	Reasons []restic.KeepReason `json:"reasons,omitempty"`
+}
+
+func loadGoldenFile(t testing.TB, filename string) (res ApplyPolicyResult) {
+	buf, err := ioutil.ReadFile(filename)
+	if err != nil {
+		t.Fatalf("error loading golden file %v: %v", filename, err)
+	}
+
+	err = json.Unmarshal(buf, &res)
+	if err != nil {
+		t.Fatalf("error unmarshalling golden file %v: %v", filename, err)
+	}
+
+	return res
+}
+
+func saveGoldenFile(t testing.TB, filename string, keep restic.Snapshots, reasons []restic.KeepReason) {
+	res := ApplyPolicyResult{
+		Keep:    keep,
+		Reasons: reasons,
+	}
+
+	buf, err := json.MarshalIndent(res, "", "  ")
+	if err != nil {
+		t.Fatalf("error marshaling result: %v", err)
+	}
+
+	if err = ioutil.WriteFile(filename, buf, 0644); err != nil {
+		t.Fatalf("unable to update golden file: %v", err)
+	}
+}
+
 func TestApplyPolicy(t *testing.T) {
 	var testExpireSnapshots = restic.Snapshots{
 		{Time: parseTimeUTC("2014-09-01 10:20:30")},
@@ -191,10 +229,8 @@ func TestApplyPolicy(t *testing.T) {
 
 	for i, p := range tests {
 		t.Run("", func(t *testing.T) {
-			keep, remove := restic.ApplyPolicy(testExpireSnapshots, p)
 
-			t.Logf("returned keep %v, remove %v (of %v) expired snapshots for policy %v",
-				len(keep), len(remove), len(testExpireSnapshots), p)
+			keep, remove, reasons := restic.ApplyPolicy(testExpireSnapshots, p)
 
 			if len(keep)+len(remove) != len(testExpireSnapshots) {
 				t.Errorf("len(keep)+len(remove) = %d != len(testExpireSnapshots) = %d",
@@ -206,39 +242,26 @@ func TestApplyPolicy(t *testing.T) {
 					p.Sum(), len(keep))
 			}
 
-			for _, sn := range keep {
-				t.Logf("    keep snapshot at %v %s", sn.Time, sn.Tags)
-			}
-			for _, sn := range remove {
-				t.Logf("    forget snapshot at %v %s", sn.Time, sn.Tags)
+			if len(keep) != len(reasons) {
+				t.Errorf("got %d keep reasons for %d snapshots to keep, these must be equal", len(reasons), len(keep))
 			}
 
 			goldenFilename := filepath.Join("testdata", fmt.Sprintf("policy_keep_snapshots_%d", i))
 
 			if *updateGoldenFiles {
-				buf, err := json.MarshalIndent(keep, "", "  ")
-				if err != nil {
-					t.Fatalf("error marshaling result: %v", err)
-				}
-
-				if err = ioutil.WriteFile(goldenFilename, buf, 0644); err != nil {
-					t.Fatalf("unable to update golden file: %v", err)
-				}
+				saveGoldenFile(t, goldenFilename, keep, reasons)
 			}
 
-			buf, err := ioutil.ReadFile(goldenFilename)
-			if err != nil {
-				t.Fatalf("error loading golden file %v: %v", goldenFilename, err)
+			want := loadGoldenFile(t, goldenFilename)
+
+			cmpOpts := cmpopts.IgnoreUnexported(restic.Snapshot{})
+
+			if !cmp.Equal(want.Keep, keep, cmpOpts) {
+				t.Error(cmp.Diff(want.Keep, keep, cmpOpts))
 			}
 
-			var want restic.Snapshots
-			err = json.Unmarshal(buf, &want)
-			if err != nil {
-				t.Fatalf("error unmarshalling golden file %v: %v", goldenFilename, err)
-			}
-
-			if !reflect.DeepEqual(keep, want) {
-				t.Fatalf("wrong result, want:\n  %v\ngot:\n  %v", want, keep)
+			if !cmp.Equal(want.Reasons, reasons, cmpOpts) {
+				t.Error(cmp.Diff(want.Reasons, reasons, cmpOpts))
 			}
 		})
 	}

internal/restic/testdata/policy_keep_snapshots_1

@@ -1,52 +1,184 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-09T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-08T20:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-07T10:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-06T08:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-05T09:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T16:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T12:30:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:08:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-09T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-08T20:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-07T10:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-06T08:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-05T09:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T16:23:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T12:30:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 7
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-09T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 6
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-08T20:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 5
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-07T10:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 4
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-06T08:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 3
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-05T09:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 2
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T16:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 1
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T12:30:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_10

@@ -1,52 +1,187 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-09T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-08T20:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-07T10:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-06T08:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-05T09:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T16:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-03T07:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-01T07:08:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:08:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-09T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-08T20:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-07T10:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-06T08:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-05T09:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T16:23:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-03T07:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-01T07:08:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "last": 1,
+        "daily": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-09T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 7
+      }
+    },
+    {
+      "snapshot": {
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+    {
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+        "daily snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_11

@@ -1,12 +1,40 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
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-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
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+    },
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+      },
+      "matches": [
+        "weekly snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_12

@@ -1,22 +1,76 @@
-[
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+      },
+      "matches": [
+        "weekly snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_13

@@ -1,22 +1,81 @@
-[
-  {
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+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_14

@@ -1,32 +1,112 @@
-[
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+      ],
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+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_15

@@ -1,37 +1,135 @@
-[
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+      },
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+      ],
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+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_16

@@ -1,17 +1,60 @@
-[
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+      }
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_17

@@ -1,52 +1,206 @@
-[
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+  ],
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+        "time": "2016-01-06T08:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 1,
+        "monthly": 2,
+        "yearly": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-05T09:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "monthly": 2,
+        "yearly": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "monthly snapshot",
+        "yearly snapshot"
+      ],
+      "counters": {
+        "monthly": 1,
+        "yearly": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "monthly snapshot"
+      ],
+      "counters": {
+        "yearly": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "yearly snapshot"
+      ],
+      "counters": {
+        "yearly": 7
+      }
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_18

@@ -1,153 +1,416 @@
-[
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": [
-      "path1",
-      "path2"
-    ],
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-15T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-13T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-12T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-10T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-08T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-20T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-11T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-10T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-09T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-08T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-06T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-05T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-02T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-01T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": [
+        "path1",
+        "path2"
+      ],
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-15T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-13T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-12T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-10T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-08T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-20T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-11T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-10T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-09T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-08T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-06T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-05T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-02T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-01T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": [
+          "path1",
+          "path2"
+        ],
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-15T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-13T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-12T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-10T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-08T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-20T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-11T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-10T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-09T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-08T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-06T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-05T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-02T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-01T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_19

@@ -1,41 +1,108 @@
-[
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": [
-      "path1",
-      "path2"
-    ],
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-15T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": [
+        "path1",
+        "path2"
+      ],
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-15T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": [
+          "path1",
+          "path2"
+        ],
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo, bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo, bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo, bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-15T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo, bar]"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_2

@@ -1,77 +1,274 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-09T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-08T20:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-07T10:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-06T08:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-05T09:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T16:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T12:30:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T12:28:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T12:24:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T12:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T11:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T10:23:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:08:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-09T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-08T20:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-07T10:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-06T08:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-05T09:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T16:23:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T12:30:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T12:28:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T12:24:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T12:23:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T11:23:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-04T10:23:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 14
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 13
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 12
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-09T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 11
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-08T20:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 10
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-07T10:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-06T08:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-05T09:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 7
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T16:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 6
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T12:30:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 5
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T12:28:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 4
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T12:24:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 3
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T12:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 2
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T11:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 1
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T10:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_20

@@ -1,161 +1,442 @@
-[
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": [
-      "path1",
-      "path2"
-    ],
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2015-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-15T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo",
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-13T10:20:30.1Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "bar"
-    ]
-  },
-  {
-    "time": "2014-11-13T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-12T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-10T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-11-08T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-22T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-20T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-11T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-10T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-09T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-08T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-06T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-05T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-02T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  },
-  {
-    "time": "2014-10-01T10:20:30Z",
-    "tree": null,
-    "paths": null,
-    "tags": [
-      "foo"
-    ]
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": [
+        "path1",
+        "path2"
+      ],
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2015-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-15T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo",
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-13T10:20:30.1Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "bar"
+      ]
+    },
+    {
+      "time": "2014-11-13T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-12T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-10T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-11-08T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-22T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-20T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-11T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-10T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-09T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-08T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-06T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-05T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-02T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    },
+    {
+      "time": "2014-10-01T10:20:30Z",
+      "tree": null,
+      "paths": null,
+      "tags": [
+        "foo"
+      ]
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": [
+          "path1",
+          "path2"
+        ],
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]",
+        "has tags [bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]",
+        "has tags [bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]",
+        "has tags [bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-15T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo",
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [foo]",
+        "has tags [bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-13T10:20:30.1Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "bar"
+        ]
+      },
+      "matches": [
+        "has tags [bar]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-13T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-12T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-10T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-11-08T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-20T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-11T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-10T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-09T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-08T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-06T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-05T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-02T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2014-10-01T10:20:30Z",
+        "tree": null,
+        "paths": null,
+        "tags": [
+          "foo"
+        ]
+      },
+      "matches": [
+        "has tags [foo]"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_21

@@ -1,7 +1,22 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "within 1d"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_22

@@ -1,7 +1,22 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "within 2d"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_23

@@ -1,17 +1,54 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:02:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:08:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:02:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "within 7d"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "within 7d"
+      ],
+      "counters": {}
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "within 7d"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_24

@@ -1,97 +1,310 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-09T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-08T20:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-07T10:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-06T08:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-05T09:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-04T16:23:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
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+}

internal/restic/testdata/policy_keep_snapshots_25

@@ -1,97 +1,310 @@
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+}

internal/restic/testdata/policy_keep_snapshots_5

@@ -1,102 +1,364 @@
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internal/restic/testdata/policy_keep_snapshots_6

@@ -1,17 +1,58 @@
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internal/restic/testdata/policy_keep_snapshots_7

@@ -1,52 +1,184 @@
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internal/restic/testdata/policy_keep_snapshots_8

@@ -1,152 +1,544 @@
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+    },
+    {
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+    },
+    {
+      "time": "2015-10-08T10:20:30Z",
+      "tree": null,
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+    },
+    {
+      "time": "2015-10-06T10:20:30Z",
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+    },
+    {
+      "time": "2015-10-05T10:20:30Z",
+      "tree": null,
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+    },
+    {
+      "time": "2015-10-02T10:20:30Z",
+      "tree": null,
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+    },
+    {
+      "time": "2015-10-01T10:20:30Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2015-09-22T10:20:30Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 29
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 28
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-09T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 27
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-08T20:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 26
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-07T10:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 25
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-06T08:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 24
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-05T09:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 23
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-04T16:23:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 22
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-03T07:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 21
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-01T07:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 20
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 19
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-21T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 18
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-20T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 17
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-18T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 16
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-15T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 15
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-13T10:20:30.1Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 14
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-12T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 13
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-10T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 12
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-11-08T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 11
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 10
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-20T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 9
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-11T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 8
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-10T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 7
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-09T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 6
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-08T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 5
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-06T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 4
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-05T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 3
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-02T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 2
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-10-01T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 1
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2015-09-22T10:20:30Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}

internal/restic/testdata/policy_keep_snapshots_9

@@ -1,32 +1,120 @@
-[
-  {
-    "time": "2016-01-18T12:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:08:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-12T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-09T21:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-08T20:02:03Z",
-    "tree": null,
-    "paths": null
-  },
-  {
-    "time": "2016-01-07T10:02:03Z",
-    "tree": null,
-    "paths": null
-  }
-]
+{
+  "keep": [
+    {
+      "time": "2016-01-18T12:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:08:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-12T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-09T21:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-08T20:02:03Z",
+      "tree": null,
+      "paths": null
+    },
+    {
+      "time": "2016-01-07T10:02:03Z",
+      "tree": null,
+      "paths": null
+    }
+  ],
+  "reasons": [
+    {
+      "snapshot": {
+        "time": "2016-01-18T12:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "last": 4,
+        "daily": 4
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:08:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "last": 3,
+        "daily": 3
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-12T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot"
+      ],
+      "counters": {
+        "last": 2,
+        "daily": 3
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-09T21:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "last": 1,
+        "daily": 2
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-08T20:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "last snapshot",
+        "daily snapshot"
+      ],
+      "counters": {
+        "daily": 1
+      }
+    },
+    {
+      "snapshot": {
+        "time": "2016-01-07T10:02:03Z",
+        "tree": null,
+        "paths": null
+      },
+      "matches": [
+        "daily snapshot"
+      ],
+      "counters": {}
+    }
+  ]
+}