Just in case, a review: RAID 1 = "mirrored drives", so 1 drive can fail & you still have all data on 2nd drive. Data is written to both drives @ same time, but only read from one. So, you lose 50% of total space, but have 100% backup in case of drive failure. RAID 0 = "striped, no parity", so you have 100% space & read/write to both drives at same time, so speed is maximum. BUT, if 1 fails, lose ALL DATA.
You'll have to decide what safety/cost tradeoff you're comfortable with. I'd say use your 1TB drive as RAID 0 for best performance. For data you have elsewhere, or can be easily re-created (video off tape, audio off discs, renders of any sort, etc), there's no need to worry. Project files, created art or any other type files should be kept backed up, on a DAILY basis, to another drive. Those files shouldn't take up a massive amount of space compared to your video files, so it shouldn't be an issue.
So now you've got your camera files to deal with. You really should have 2 copies at all times. 1 set on 200GB, 1 set on 1TB while working a project. Project is done, copy all project files from 1TB onto one or two "bare" external SATA drives. Cheapest way is to use:
http://www.newertech.com/products/products_univ_adptr.php
Only $25! 2 drives of course gives you much more safety.
Then erase 200 & 1TB, go shoot some more.
