You have to specify the protection policy for your datasets using the Configuration wizard. The protection policy assigned to a dataset determines how replications are done. It also determines how long backups are retained on the secondary storage SnapVault target.
You can assign any these protection policies to the dataset:
Both the Back up policy and the Remote backups only policy have scheduled SnapVault replication that happens in the background along with "on demand" SnapVault replication that happens when you do a backup or verify operation with SnapManager.
The "backup retention type determines the duration for which the archived backups are retained and which backups are verified during a "verification only" operation.