I want to create a computer with a lot of storage that will be use only for
storing backup. I want to use the ntbackup software.

Setup:
I created a custom built pc with a raid card and windows xp2.
There is two drives in the pc that are setup in raid 1.
There is only 1 partition that has the os and where the backups will be
stored.
I created a folder in the C Drive named backups and shared this folder.

Question:
How can i setup ntbackup so that it will backup and keep 1 week worth of
data? I want the backups to stay in the Backups folder.
Here is the issue how do i setup if possible NTbackup so that it will only
use a certain amount of drive space so that it doesnt fill the drive
completely and when ntbackup fills its allocated space it will automatically
start writing over the first file it created. Kinda like a DVR for a camera
system.