| Possible value | Notes |
|---|---|
| 0 – 9, or i |
The default value is 0 (full backup). If the value is set to 4, an incremental backup is taken based on the most recent previous backup of the same FILESYSTEM with level 0, 1, 2, or 3. If the value is set to i, an incremental backup is taken based on the most recent previous backup of the same FILESYSTEM of any level. |