Database Expiry date is not for deleting old backups; it indicates when the file can be overwritten. But since you are using the maintenance plans the file name will always be new so it will never trigger that.
Instead of using that, use the "Maintenance Plan Cleanup" task, set it to delete backups older then 6 days.
Thanks.
Mohit K. Gupta, MCITP: Database Administrator (2005), My Blog, Twitter: @SQLCAN[/url].
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