by 
Max Power
ANSWERS: 2
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Aside from having backups, it's pretty much your only option. However, the problem is that there are many types of RAID. For example RAID 0, called striping, spreads data between 2 or more drives, but has no redundancy and therefore no fault tolerance. By comparison, RAID 1, called mirroring, mirrors all data between two drives. If one fails, you still have the other available. I could type out a long answer, but there is an incredibly detailed and professional raid tutorial at http://www.acnc.com/04_00.html which will probably provide you with all the answers you are looking for better than I can word it. The levels you are most likely to be interested in are: 0, 1, 5, 0+1 and 1+0 as these are the most commonly supported levels of RAID.
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RAID is a general term which actually covers several different ways of making data more reliable by using extra disks. So basically, RAID is *all* the ways of getting fault tolerance, except for backing up.
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