I'm using the latest fully updated DPM 2012 R2 on Server 2012 R2 also fully updated. Yesterday it marked a few tapes as being offsite ready so I removed them from the tape library, did an inventory to ensure they weren't still listed as being there when they weren't and ensured that it had a tape to co-locate the backups to that night. This morning I have a lot of 'Cannot verify tape data' warnings with the event logs indicating that it was trying to use some of the tapes that I removed yesterday for verification.
Why is it trying to use tapes that aren't there? What can I do to prevent it doing this?