You can either burn an image(or, better yet, Ghost one) to back up your system in case a drive fails, or you can go either RAID 01 or RAID 5. Both of these RAID types involve striping
and mirroring for parity. If one drive fails, the parity drive(s) recover the lost data on the fly. Expensive, but a great way to keep your data secure. This is what servers with critical data use. . .
Just my $0.02.
