We are in the process of migrating backups to DPM 2012 R2 and have an unforseen issue.
We have a volume mounted on a server that we used to back up by driver letter on our legacy software but in DPM this does not work as the Volume GUID under this drive letter changes each month (it is a snapshot from a SAN that is mounted automatically before the backup so the most recent is always backed up to tape).
As DPM uses these to track its backups it simply thinks the drive is not there once the underlying GUID changes.
Is there a way round this? Or anything worth trying?