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What increment chains are

An increment chain consists of a series of incremental backups of the same path. Because you can specify any level of backup at any time, you must understand increment chains to be able to perform backups and restores effectively. You can perform nine levels of incremental backup operations.

There are two types of increment chains:

Incremental backups base themselves on the most recent lower-level backup. For example, the sequence of backup levels 0, 2, 3, 1, 4 gives two increment chains: 0, 2, 3 and 0, 1, 4. The following table explains the bases of the incremental backups:

Back-up order Increment level Increment chain Base Files backed up
1 0 Both Files on the storage system All files in the back up path
2 2 0, 2, 3 The level-0 backup Files in the backup path created since the level-0 backup
3 3 0, 2, 3 The level-2 backup Files in the backup path created since the level-2 backup
4 1 0, 1, 4 The level-0 backup, because that is the most recent level that is lower than the level-1 backup Files in the backup path created since the level-0 backup, including files that are in the level-2 and level-3 backups
5 4 0, 1, 4 The level-1 backup, because it is both of a lower level and more recent than the level-0, level-2, or level-3 backups Files created since the level-1 backup