8 | Full | Incr1 | Incr3 |
|
| ||
9 | Full | Incr1 | Incr2 | Incr3 | |||
10 | Full | Incr2 | Incr3 | ||||
11 | Full | Incr3 |
How to read Table 7 on page 95
•The rows in Table 7 on page 95 are independent of each other and show different situations.
•The age of the backups increases from right to left, so that the far left is the oldest and the far right is the most recent backup.
•The full and IncrX represent still protected objects of the same owner. Any existing IncrX that is not protected can be used for restore, but is not considered for referencing on subsequent backup runs.
Examples
•In the second row, there is a full, still protected backup and an Incr2 is running. There is no Incr1, so the backup is executed as an Incr1.
•In the fifth row, there is a full backup, an Incr1 and another incremental is running. Data Protector references the currently running backup to the previous incremental, that is Incr1.
•In the eighth row, the Incr3 is executed as Incr2, and in the eleventh row, the Incr3 is executed as Incr1.
Considering restore
To restore the latest data, you need media from your last full backup and subsequent incremental backups. Therefore, the more incremental backups you have, the more media you need to handle. This is inconvenient if you use standalone devices, and the restore can last long.
Using simple and leveled incremental backups, as indicated in Figure 25 on page 98, will require access to all five previously completed media sets, up to and including the full backup. The space needed on the media is lowest here, but the restore is rather complex. The series of required media sets is also called a restore chain.
96 | Planning your backup strategy |