Backup Levels

Since a full backup is equivalent to a level 0, selecting Full matches only full level backups. Selecting 9would match all save sets backed up at a level 9, level 8, level 7, etc. To match incremental and client-initiated save sets, All must be selected.

Figure 23 showing a level 5 backup on October 8, which backs up everything that changed since the full backup on October 1. To fully recover from a disk crash on October 8, you only need the data from October 1 and the new level 5 volume. You no longer need the data from the level 7 backup on October 4 (or the subsequent incremental backups performed on October 5, 6, and 7) because the new level 5 backup includes that data.

Also, a level 7 backup on October 11 backs up all of the data that changed since the last lower-numbered backup (in this case, the leve l 5 backup on October 8). To recover from a disk crash on October 11, you need three volumes: the full volume from October 1, the level 5 volume from October 8, and the new level 7 volume.

Figure 24 showing a level 5 backup on October 15, which backs up all of the data that change d since the last lower-numbered backup. Because no backup lower than level 5 has been performed since the full backup on

October 1, this level 5 backs up all of the data that changed since the full backup. Therefore, to recover from a disk crash on Octo ber 15, you only need the data from the full backup on October 1 and the new level 5 backup.

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About Ahmad Sabry ElGendi

https://www.linkedin.com/pub/ahmad-elgendi/94/223/559
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