When changing the PG (Protection Group) that my server belongs to, I normally get this error message:
DPM cannot protect \\CHEF2.thefoleyhouse.co.uk\Optical Drive\. The recycle bin, the System Volume Information folder, non-NTFS volumes, DFS links, CDs, Quorum Disk (for cluster) and other removable media cannot be protected. (ID: 38)
Today, it suddenly changed to:
DPM cannot access the path \\CHEF2.thefoleyhouse.co.uk\Optical Drive\ because part of the path has been deleted or renamed.
Check the path and enter it again.
Details: Internal error code: 0x80990A93
It took me a little while to realise that this was because I had removed the DVD from the drive! I thought I'd broken something by reinstalling the DPM client!