If my house burned to the ground, my concerns would go beyond the need to re-rip some CDs or asking HD tracks to queue a purchase or two if timing were bad. Any NAS would be toast in that event. Not today. As an IT professional I’m well aware of the various flavors. Perhaps its time for you to read my post again. I maintain six additional copies in the fireproof safe. Remember walking all of thirty feet? The off site copy is for disaster recovery. The obvious differences being that the backups are run about half an hour per month extending their life, reducing noise and vibration. RAID is unnecessary for largely static data. Spin all the drives you want!