About retention period for backup from snapshot images
In a NAS-data-protection policy, expiration of a backup from snapshot image depends on the SLP retention period.
In a NAS-data-protection policy, a backup from snapshot job follows a hierarchy with a parent job and multiple child jobs. The number of child jobs depends on the number of streams that you define in the policy.
After all child backup jobs complete, the parent backup from snapshot job calculates the expiration time as follows:
Iexp=Tchild_max+Rslp
Where:
Iexp=Image expiration time of the NAS-data-protection policy backup job.
Tchild_max= Completion time of the longest-running child backup job.
Rslp=Retention period defined in the SLP for the backup from snapshot jobs.
For example, if the last child backup job completes on Friday at 9 PM and the SLP retention period is 6 days, the expiration time for the backup from snapshot image is on the following Thursday at 9 PM.