Choosing an Expiration Policy

You can choose from the following three expiration policies:

• Retention date (-t) deletes all backups before a particular date and time.
• Retention interval (-i) deletes all backups older than some period of time.
• Retention generation (-g) keeps a certain number of versions of each backup.

ON–Bar always retains the latest level-0 backup for each storage space. It expires all level-0 backups older than the specified time unless they are required to restore from the oldest retained level-1 backup.

ON–Bar expires all level-1 backups older than the specified time unless they are required to restore from the oldest retained level-2 backup.