doc/backup-and-restore.md

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+# Backups
+
+We're using [Ark][1] for backing up Kubernetes config and GKE resources.
+
+## Backup location
+
+Cluster configuration (including all live resources) is backed up to [a Google
+Cloud Storage container][3].
+
+## Persistent volumes
+
+Persistent volumes are just GCE disks. Thus, with the current config, Ark
+creates volume snapshots as native [GCE disk snapshots][2].
+
+[1]: https://heptio.github.io/ark/v0.10.0
+[2]: https://console.cloud.google.com/compute/snapshots?organizationId=772167872692&project=fluted-magpie-218106&tab=snapshots&snapshotssize=50
+[3]: https://console.cloud.google.com/storage/browser/sidamo-backups?project=fluted-magpie-218106&organizationId=772167872692