· Rollup applies each granularity cell (e.g., keep all snapshots for X days, keep one snapshot per hour for X days, etc.) of the retention policy in turn
· The retention policy is not applied to the current day: today is considered “Day 0”. Configuring it to keep all recovery points for one day means it will keep all recovery points for yesterday. All of the recovery points for today are automatically retained
· Rollup combines the recovery points being rolled up for each granularity cell. If there are twenty-four hourly recovery points being rolled up into one daily recovery point, AppAssure will take all the changes in those twenty-four recovery points and combine them into one (keeping the latest version of each changed block). Therefore, the result is one, slightly larger recovery point of how the system was at the point in time of the displayed date/time stamp
· The retention policy is applied to each protection group individually. Volumes that have the same backup interval create a protection group. If C and D are being backed up at hourly intervals and backups of D start failing indefinitely, when AppAssure rolls those hourly recovery points into daily recovery points it will result in one recovery point of C and D, and another recovery point of C
Rollup in AppAssure 5.3 and Earlier
· The base image is never rolled up. Instead recovery points are rolled into the incremental immediately after the base image
· Recovery points are rolled up into the most recent recovery point within the granularity cell. That is, if it's configured to keep all recovery points for 7 days, and today is 4/9, the recovery points will be rolled into the last recovery point taken on 4/1
· If C is being backed up every hour and E is being backed up every three hours, there will be some recovery points of C, and some recovery points of C and E
Rollup in AppAssure 5.4 and Later
· The base image gets rolled up
· Recovery points are rolled up into the earliest recovery point outside of the granularity cell. That is, if it's configured to keep all recovery points for 7 days, and today is 4/9, the recovery points will be rolled into the first recovery point taken on 4/2
· If C is being backed up every hour, and E is being backed up every three hours, the two volumes will never be in the same recovery point. For example, there could be a recovery point of C from 3:00:03AM and a recovery point of E from 3:00:22AM. Organizing the recovery points by protection groups offers a clearer depiction of how the retention policy will be applied
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