Just purchased my first NAS (Synology DS214Play) which houses a pair of 3TB WD Red HDDs running SHR Raid. I am looking for suggestions on how to back this puppy up regularly. Not looking for anything fancy just cheap reliable dumb storage. Super fast transfer speeds are not necessary but then again I don't want a 3TB backup to take hours. Basically something that plays nice with Synology, is about the size or smaller than a DS214, and does not have any preloaded software or anything else. Not looking for the least expensive solution, just the best bang for my buck.