SQL Server 2008 R2 - Full Nightly Backup Overwrite

I'm trying to get SQL Server 2008 R2 to perform a full backup of each database on a nightly basis and overwrite the existing backup files in the folder from the previous night.

I have a maintenance plan running and the backup runs each night successfully, but the files are not being overwritten.  My maintenance plan is creating a backup file for every database as it should.

Inside of the maintenance plan dialog, I have the box checked "backup set will expire" and then I selected the radio button "after" with a value of 1 day.

What am I missing so that SQL Server 2008 R2 will overwrite the files?

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ded_chConnect With a Mentor Commented:
in the Maintenance plan, add a "Maintanance Task" to your backup plan.
It is an option you can drag from the bottom left.

Then configure it to clear all backup files that are older than x days (in your case 1)

Add this Task to the bottom of the plan.
After a sucessful backup, the older files will then be automatically deleted.
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