How USB disk rotation works
Using the USB disk rotation feature, you can rotate your available USB disks to use as backup destinations. Older backups are automatically cleaned up, depending on the number of USB disks and the number of recovery points the job is set to retain. When the recovery point set limit is reached, older recovery points (base and incrementals) are deleted when the USB disk containing the oldest recovery points is inserted. Using this feature, you are not required to edit the backup job and change the backup destination to add a new USB disk.
The following table displays an example of how USB disk rotation works when the number of USB disks available is 2 and the recovery point set limit is 3.
Related information
Table: USB rotation example
| Day | USB 1 | USB 2 | Remarks |
|---|---|---|---|
| Monday | 1.v2i | - | - |
| Tuesday | 1_001.iv2i | - | - |
| Wednesday | 1_002.iv2i | - | - |
| Thursday | - | 2.v2i | USB rotated |
| Friday | - | 2_001.iv2i | - |
| Saturday | - | - | - |
| Sunday | - | - | - |
| Monday | 3.v2i | - | USB rotated |
| Tuesday | 3_001.v2i | - | - |
| Wednesday | - | 4.v2i | The number of recovery points in this example are set at 3. When you attach USB 2 and recovery point set 4 is created, recovery point set one cannot be deleted as it is on USB 1. |
| When you attach USB 1 in the future, recovery point set 1 is deleted automatically before the backup job starts running. | |||
| Thursday | - | 4_001.iv2i | - |
| Friday | - | 4_002.iv2i | - |
| Saturday | - | - | - |
| Sunday | - | - | - |
| Monday | - | 5.v2i | USB rotated and recovery point set 2 is deleted automatically. |
| Tuesday | - | 5_001.iv2i | - |
| Wednesday | 6_v2i | - | USB rotated and recovery point set 1 is deleted automatically. After recovery point set 6 is created successfully, recovery point set 3 is deleted automatically. |
| Thursday | 6_001.iv2i | - | - |
| Friday | 6_002.iv2i | - | - |