Manage Backup Size
Sometimes you may need to recover some disk space and Windows 7 allows you to manage the size of your backups. In the Backup and Restore section click on the Manage Space link.
Your given a summary of the backup location and what is taking up space from the backup.
Click on the View backups button to check the different dated backups where you can delete older ones if needed.
You can also change how windows retains older system images.
Backing up data is one of the most important but overlooked tasks for a computer user. If you have another backup app you might not consider letting Windows do it, but overall, the new backup and restore utility in Windows 7 is much better than previous versions.