A VM GRT Backup job hangs until auto cancelation and snapshot not removed
I'm backing up a VM to disk using GRT (Backup exec 2010 R3, SP2)
The job usually backsup 13Gig and takes 20 minutes.
Yesterday, out of the blue, the job took more than an hour and was canceled.
I ran the job again and noticed it finishes to backup all 13Gig but than just hangs until the auto cancelation kicks in.
I also noticed the snapshot was not removed from the VM. It looks like it's not even trying to remove the snapshot.
What could be the problem?