Time Machine - Mac Pro - 4 Drives, 2 for data, 2 for TM Backup?

Here's the scenario,
Mac Pro with 4 drives. I'd like to have 2 of the drives for my data, OS, etc, and the other 2 for Time Machine backups.
Assuming the following,
Drive 1 (750GB), back up to Drive 2 (1TB)
Drive 3 (750GB), back up to drive 4 (1TB)
Is it possible to use Time Machine to simultaneously back up two different drives on one machine to two other drives?
Yes, I know part of the reason for a back up is to store it off line, off site, etc... My main reason to use TM is to recover any data that might have changes, been thrown out, or to recover a failed drive, and though I could use RAID for the recover drive scenario, I think I like the idea of using TM.
Thanks

Yes, you could but I would not recommend using a RAID as a startup volume. That's not what RAIDs are for.
If you want greater control over backups then TM isn't the way to go. Here are some backup programs better suited to the job:
Backup Software Recommendations
My personal recommendations are (order is not significant):
1. Retrospect Desktop (Commercial - not yet universal binary)
2. Synchronize! Pro X (Commercial)
3. Synk (Backup, Standard, or Pro)
4. Deja Vu (Shareware)
5. PsynchX 2.1.1 and RsyncX 2.1 (Freeware)
6. Carbon Copy Cloner (Freeware - 3.0 is a Universal Binary)
7. SuperDuper! (Commercial)
8. Intego Personal Backup (Commercial)
9. Data Backup (Commercial)
The following utilities can also be used for backup, but cannot create bootable clones:
1. Backup (requires a .Mac account with Apple both to get the software and to use it.)
2. arRSync
Apple's Backup is a full backup tool capable of also backing up across multiple media such as CD/DVD. However, it cannot create bootable backups. It is primarily an "archiving" utility as are the other two. In some respects Backup is similar to Time Machine.

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