I'm sorry you never got my response. I answered you on August 29, 2011.
I just forwarded you the original answer by email. Can you let me know you got it?
Here's a copy of what I wrote in case you don't get an email from me:
You can keep the notification email for 30 days. By that time a new backup will be made and the old backup will be less relevant.
You can always access the complete list of backups made on your tree by logging into your family site and clicking on Family Tree > Backup.