Thanks JOe, that is still completely over my head. Do you have a photo and/ or link to the set up to buy? I'll keep it in mind for next round - in 5 years. I just bought all these.
What is complicated on my system? I just have three externals sitting behind the computer. SD backs up one, once a day (which has sufficed), and the 3rd is time machine.
Speed seems ok, especially now with USB 3.
