doc/backup-and-restore.md

@@ -1,6 +1,19 @@
 # Backups
 
-We're using [Ark][1] for backing up Kubernetes config and GKE resources.
+We're using [Ark][1] for backing up Kubernetes config and GKE resources. It is
+available as a Git submodule in the `vendor/` folder (incl. the `ark`
+executable).
+
+In order to initialize submodules in your local repo, run once:
+
+    git submodule init
+
+Then, to fetch/update the modules, run:
+
+    git submodule update
+
+The Ark service is running on the Sidamo cluster and was set up using the
+[official docs' GCP instructions and config files][4].
 
 ## Backup location
 
@@ -15,3 +28,4 @@ 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
+[4]: https://heptio.github.io/ark/v0.10.0/gcp-config