At $0.15/GB it's a no-brainer for the piece of mind. I once heard of a case (not with Amazon) where data was replicated in 3 locations, and data got corrupted

At $0.15/GB it's a no-brainer for the piece of mind. I once heard of a case (not with Amazon) where data was replicated in 3 locations, and data got corrupted in one location and was copied to the others, resulting in corrupted data in all 3.