Raid 10 would be the most efficient and secure of the options. Raid 10 allows 2 drives to drop out with out Data failure. It also combines the drives to provide a bit more spread and performance.
If you cannot afford a 4 Drive alternative, then I'd suggest Raid 1 as a options. It acts a mirror but will decrease performance a bit over I/O. But you sacrifice a bit for a layer of security.
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