You can set the Advanced Open File Option (AOFO) default options for every backup job.
After a job is completed, check the section Backup Set Detail Information in the job log to make sure that AOFO was used during the backup.
To set default options for AOFO
On the Properties pane, under Job Defaults, click Advanced Open File.
Select the appropriate options.
Configuring the Advanced Open File Option for backup jobs
Best practices for using the Symantec Volume Snapshot Provider