How does the “Remove retention files for overlap policy” work under the Advanced Retention Policy task?
In general, the daily snapshots are eliminated, followed by weekly or monthly snapshots, or weekly snapshots followed by monthly or 4-month snapshots, etc. This is shown in the following example: We assume that today is 17 January 2006 and the Advanced Retention Policy is as follows: • Daily: 7 day retention • Weekly: 4 week retention (the task will be carried out on Saturday) • Monthly: 3 month retention (the task will be carried out on the first day of each month) If ” Remove retention files for overlap policy” is not enabled: Then, a total of 14 snapshots will be kept on the server, as fitting (7+4+3) ex.: ( Daily ): 10Jan06, 11 Jan06, 12Jan06, 13Jan06, 14Jan06, 15Jan06, 16Jan06 ( Weekly ): 24Dec05, 31Dec05, 7Jan06, 14Jan06 ( Monthly ): 1Nov05, 1Dec05, 1Jan06 If ” Remove retention files for overlap policy ” is enabled: Then only the following snapshots will be maintained: 1Nov05, 1Dec05, 1Jan06, 14Jan06, 15Jan06, 16Jan06. Specifically, the weekly policy will cancel the daily policy
