Well if your enclosure fails you replace it, reformat your drives if they can't be read by the new enclosure and restore from the USB drives.

I agree that if you are running a NAS with more than 2TB data my solution is not viable. But for those of us with less than 3000 CDs (say 1.5TB) and no interest in video streaming it is surely viable and cost effective. Plus if you have back to back NAS you still need on an off-site backup to protect against fire, flood, lightning strikes, and theft.

But I am 100% with you that you cannot rely on a single RAID NAS.

MC200, Twinstore, 808v6/ID41 -> DSP8000SE (+ SB Touch, Sony BDP-3300, SKYHD, legacy cassette player)
2nd system: MC200 analogue out, Linn LP12, SB3 -> Quad 34 -> M60 rosewood
F80 (Rubino Micallizzato)
F80 (Rosso Corsa)