When my DS1515+ plus died due to the special intel atom bug, I started looking at replacement NAS. The DS1621+ was a good choice as it comes with 6 bays, only used 4 bays in the previous NAS. This 6 bay NAS allows me now to plan to say get 2x 8tb/10tb then I can copy all the data from the 4 drives to the 2x 8tb/10tb pool decommission the 4 drives and then add more drives to the empty bays and increase storage capacity. I prefer Ryzen processor over Celeron's, time will tell if I made the right choice. I plugged in my old drives followed the prompts and had my data back. Just note this only works going from one Synology to another Synol...view more