Comment My recommend: Two drives and software purchase. (Score 1) 366
In addition: I recommend that you download install and run "Hard Drive Sentinel"; I've been using it for years, and it is able to aid in the prediction of failure of multiple dives that I've had; resulting since I've used it with no data loss. This software can see into the drives of the RAID array; and to help you to know if you might expect a failure of one of the drives in your RAID array-- or if one of your back-up drives starts to experience problems.