When troubleshooting NetWorker backups, I typically look to see if the failed VM has an older snapshot that was not deleted and remove it.  Thinking I’m awesome and have solved the VMs backup problem, I’m surprised to see that, more often than not, the VM backup fails the next time the backup runs.  Why, because the MNT directory for the failed backup job/VM still exists on the backup proxy.  Why do I always forget to check the MNT directory!!  Hopefully writing it down will help me to remember.