After a lifetime of good luck, I had 4 hard drive failures in the last week. In fact, while rebuilding a 2 TB drive in a 12 TB RAID, another drive started going bad.
Tech Support: "That is bad, but not terrible. We'll stop the rebuilding process and just find someplace else to back up that 8 TB of data while we replace that drive."
An extra 8TB? I'm sure in 2017, that will be a simple request. Thank you Amazon Prime.