velero: add page (#3153)

pages/common/velero.md

@@ -0,0 +1,24 @@
+# velero
+
+> Backup and migrate Kubernetes applications and their persistent volumes.
+> More information: <https://github.com/heptio/velero>.
+
+- Create a backup containing all resources:
+
+`velero backup create {{backup_name}}`
+
+- List all backups:
+
+`velero backup get`
+
+- Delete a backup:
+
+`velero backup delete {{backup_name}}`
+
+- Create a weekly backup, each living for 90 days (2160 hours):
+
+`velero schedule create {{schedule_name}} --schedules="{{@every 7d}}" --ttl {{2160h0m0s}}`
+
+- Create a restore from the latest successful backup triggered by specific schedule:
+
+`velero restore create --from-schedule {{schedule_name}}`