Notes on CSV backup and restore

NetBackup can back up the virtual machines that are configured in cluster-shared volumes (CVS).

Note the following:

During the backup, the cluster-shared volume (CSV) enters the online state ("Backup in progress, Redirected access"). The cluster node that performs the backup becomes the owner of the CSV.
Cluster nodes can back up the same CSV simultaneously.
See Cluster shared volumes timeout (Hyper-V with VSS).
A single node containing two virtual machines can back up both virtual machines simultaneously, even if they use the same CSV. As long as both virtual machines reside on the same node, simultaneous backups are allowed.
For a successful backup of a virtual machine on a CSV, the virtual machine must use CSV volumes only. If a local disk on the Hyper-V server (not a CSV volume) is added to the virtual machine, the backup fails with status 156.
Reconfigure the virtual machine to use CSV volumes only, and retry the backup.