The “Backup set will Expire” option is used to indicate how long a backup should be prevented from being over written by another backup file of the same name. This setting will not delete the old backup files that have expired. When using this option, it is prudent to create a maintenance plan that uses the “Maintenance Clean up Task” to delete expired backups files older than a certain number of days (set the days to match the expiring date +1).

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