-The backup retention period governs how far back in time can a point-in-time restore operation be performed, since its based on backups available. The backup retention period can also be treated as a recovery window from a restore perspective. All backups required to perform a point-in-time restore within the backup retention period are retained in backup storage. For example - if the backup retention period is set to seven days, the recovery window is considered last seven days. In this scenario, all the backups required to restore the server in last seven days are retained. With a backup retention window of seven days, database snapshots and transaction log backups are stored for the last eight days (1 day prior to the window).
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