I've got a Server 2012 Standard OS with failing backups (WSB.)
SEP 12.1.2 MP1 is installed. E:\* is defined as an exception to all scans in SEP. All VSS writers show 'no error.'
Here is the specific error within WSB: Error in deletion of [E:\System Volume Information\EfaData\SYMEFA.DB] while pruning the target VHD: Error [0x80070020] The process cannot access the file because it is being used by another process.
This issue started after two weeks of successful backups, while running SEP 12.1.2. After upgrading to SEP 12.1.2 MP1, I rebooted the server, then stopped and re-created scheduled backups, formatting the destination disk. Manually running the scheduled scan from task scheduler worked once, but the scheduled backup failed that same night... same error.
I have an existing case open with Symantec... I just wanted to post this for other people, as this thread doesn't seem to provide a fix.
-ciao
ricardo