Document installing velero CLI program

docs/maintenance.rst

@@ -22,7 +22,13 @@ On your cluster
 Stackspin supports using the program Velero to make backups of your
 Stackspin instance to external storage via the S3 API. See
 :ref:`backups-with-velero` in the installation instructions for setup details.
-By default this will make nightly backups of the entire cluster (minus
+
+For the maintenance operations described below -- in particular, restoring
+backups -- you need the ``velero`` client program installed, typically on your
+provisioning machine although you can also run it on the VPS if preferred. You
+may find it at `Velero's github release page`_.
+
+By default Velero will make nightly backups of the entire cluster (minus
 Prometheus data). To make a manual backup, run
 
 .. code:: bash
@@ -159,6 +165,7 @@ following command that will apply the changes to all installed kustomizations:
     flux get -A kustomizations --no-header | awk -F' ' '{system("flux reconcile -n " $1 " kustomization " $2)}'
 
 
+.. _Velero's github release page: https://github.com/vmware-tanzu/velero/releases/latest
 .. _Velero’s documentation: https://velero.io/docs/v1.4/
 .. _reach out to us: https://stackspin.net/contact.html
 .. _taints: https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/