backup: store statistics in snapshot

cmd/restic/cmd_backup.go

@@ -451,6 +451,7 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
 	}
 
 	timeStamp := time.Now()
+	backupStart := timeStamp
 	if opts.TimeStamp != "" {
 		timeStamp, err = time.ParseInLocation(TimeFormat, opts.TimeStamp, time.Local)
 		if err != nil {
@@ -640,6 +641,7 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
 	snapshotOpts := archiver.SnapshotOptions{
 		Excludes:       opts.Excludes,
 		Tags:           opts.Tags.Flatten(),
+		BackupStart:    backupStart,
 		Time:           timeStamp,
 		Hostname:       opts.Host,
 		ParentSnapshot: parentSnapshot,