^^^
You're forgetting he has a 1:1 backup going on with a second server. That's pretty damn secure.
What would be even more secure is to have a third system that backs up the second system. The money spent on the second system would be better spent of a card capable of RAID6 with twice as much storage space. But that is me - trying to be more efficient with my money and using enterprise-level proven technologies is something than appeals to me more than having a second mirror system.