Alot Of Room Needed?

hey everyone,
i have a macpro with 3, 750 gig hard-drives in it.
one is my mac hd 750gig
the other is my media hd 750gig
and the third is my time machine 750gig
i have more then 750 gig on the two drives that i need to back up
can i use two hard-drives to backup to?
or how do i back up such a large amount of stuff... its prolly close to 1 tb

You can use a 1 tb or larger drive to back-up the two that total 750 gb, but it probably won't work for long, as you'll have very little space for subsequent incremental backups.
The general rule of thumb is, your TM volume should be 2 - 3 times as large as what it's backing-up. This varies greatly, of course, depending on how you use your Mac. If you frequently add or change lots of big files, even 3 times may not allow for a few weeks of backups. But if you're a light user, 2 times or even less might do.
You can only back-up to a single volume; but that volume can be a "concatenated RAID set" of 2 or more drives (also called a JBOD, Just a Bunch Of Disks). See the Help for Disk Utility (in your Applications/Utilities folder) for +Concatenated Raid.+
Another solution might be to use a disk 2 - 3 times the size of the data on your internal disk for TM, and back the media drive up separately, either to DVDs or to another external drive via a different application, such as CarbonCopyCloner. If the data on the media drive doesn't change much, this might be better.

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