- >- Each log backup is chained to the previous full backup to form a recovery chain. This full backup is retained until the retention of the last log backup has expired. This might mean that the full backup is retained for an extra period to make sure all the logs can be recovered. Let's assume a user has a weekly full backup, daily differential and 2-hour logs. All of them are retained for 30 days. But, the weekly full can be cleaned up/deleted only after the next full backup is available, that is, after 30 + seven days. For example, if a weekly full backup is performed on November 16th, it remains stored until December 16th in accordance with the retention policy. The final log backup for this full occurs on November 22nd, before the next scheduled full backup. Since this log backup remains accessible until December 22nd, the November 16th full backup cannot be deleted until that date. As a result, the November 16th full backup is retained until December 22nd.
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