Add ability to specify order of backup and restore of Persistent Volumes

[yashbhutwala]

Describe the problem/challenge you have
I would like to be able to specify the order of backup and restore of Persistent Volumes. For my use-case, the order in which the state of two different databases is captured is very important.

[nrb]

This would be an interesting capability to add, but would like input for @VMmore on roadmap timing.

[yashbhutwala]

The workaround I'm doing now, is creating a separate backup with 1st level of PVs, and a separate backup for the second step. And then applying the restore in reverse order.

[nrb]

@phuongatemc Does your ordering enhancement fix this issue?

[phuongatemc]

@nrb Yes, the Velero 1.5.1 work for for us.

[nrb]

@yashbhutwala See #2724 for how to specify an ordering for resources on backup now. This is not yet supported on restore, though.

[eleanor-millman]

Closing because the reporter found a workaround and we expect this to be solved by app-aware backups (Velero 2.0 or a bit later).