Dell PowerVault DR4100 - Manual (Page 21)

21 Setting Up the Dell™ DR Series System on Symantec NetBackup to Use Virtual Synthetic Backup | February 2014
Enter policy attributes under Attributes tab: Policy type as MS-Windows (for Windows) or 20.
Standard (for Linux); Policy storage as the DR storage unit that was created in steps 14- 16; enable
Collect true image restore information and check with move detection.
On the Schedules tab, create three schedules: one for Full Backup, a second one for either 21.
Differential Incremental Backup or Cumulative Incremental Backup, and a third one for Full
Backup with the Synthetic backup option enabled.
The schedule should be such that first a full backup runs, then an incremental backup, and finally a
synthetic full backup.