How Can I Unhide Windows Backup?

Background >>
I am using Win 7 and so far have only used Acronis 11 to image my hard drive onto a backup hard drive. I have allowed Windows Backup to continue making automatic backups onto a 2nd drive that is seldom used. Recently the 2nd drive became too full to make another automated backup and the Windows Action Center provided a link that opened a window and allowed me to individually delete old backup files. This cleared up a lot of space and solved the immediate problem.

Goal >>
In the future I want to delete the older Windows Backup files (keep only the 3 or 4 most recent) before they accumulate and fill disk.

Problem >>
When I follow the command links (Control Panel > All Control Panel Items > Backup and Restore) to get to the "Manage Space" option that allows me to delete the backups ... it seems Acronis has intercepted the backup process and only provides me with Acronis options. How can I access the Win 7 Backup system with Acronis installed?

The following link provides screen shots of the task I am trying to accomplish:
http://www.sevenforums.com/tutorials/628-backup-user-system-files-delet…

Thanks for any replies.

-- John