The following requirements must be in place in order to use the Advanced Open File Option.
If the Advanced Open File Option is to be used locally, then the media server must have Advanced Open File Option license installed properly.
The volumes you want to back up with the Advanced Open File Option must have enough free disk space to start the AOFO operation. Free disk space should at least equal the size of the backup job being backed up.
The Advanced Open File Option loads a filter driver named vsp.sys, which must be present. Verify if the Advanced Open File Option driver, which is named vsp.sys, is present. The vsp.sys should be located in %systemroot%\system32\drivers.
In addition, restart the media server and verify the results. Also stop the Anti-virus services during the backup job.Message was edited by:
Abhinav