You really could use ONE more drive.
Keep the OS drive as it is. Do not put media on this drive. You could put all your proj. files on this drive for sure.
The other 1TB drive you could raid with a third drive. (it never ends)
This is a simple process thru the OS:

This will not give you redundancy. It will give you speed and storage.
You could then buy Ext. FW Drives to back up your media/files onto. That way you have a backup…until they fill up and they will.
Chris Tompkins
Video Atlanta LLC