Dell PowerVault DR6000 - Manual (Page 30)

30 Setting up NetVault Backup Native Virtual Tape Library on the Dell™ DR4X00 Disk Backup Appliance
4 Set up the DR4X00 Cleaner
Once all the backup jobs are setup the DR4X00 cleaner must be scheduled. The DR4X00 cleaner should
run at least 6 hours per week when backups are not taking place, generally after a backup job has
completed.
Performing scheduled disk space reclamation operations are recommended as a method for recovering
disk space from system containers in which files were deleted as a result of deduplication.