You can manage your file
and folder backup data by limiting the number of versions of backup
files that you keep. This kind of maintenance can significantly
reduce the amount of disk space required, especially if the files
are large, as is often the case with audio and video files.
To limit the number of file versions to keep
On the Tools page, click
Select Limit file versions for file and folder
backups, and then type a number between 1 and 99.
You can also select
Monitor disk space usage for backup
storage, and then specify a limit to the total amount of
disk space that can be used for both recovery points and file and
folder backup data.