I would buy a Synology 4-disc NAS and 2x 8TB or 2x 10TB (the bigger the better) and add 2 more later. I have one with 4x10TB discs all still sitting in a box waiting for me to get off my lazy backside and put it all together!)I have to make the plunge and buy a new NAS and drives. Mine is full........
So, if I get a 4-bay (which I will)....what is recommendation for TB per drive?? I mean, I'm not made of money, so that has to be part of the equation unfortunately. If I get four 4TB drives, that will cost about $400... Or, should I get two 8TB drives for now? Do I have to have all 4 filled? Talk to me peeps...what makes sense? Nearly all my music library is ripped...so all I'm doing now is adding a title here and there as I buy them.
(As your current NAS is Synology you will keep compatibility as you have SHR set-up which allows for different discs sizes, so you could even put the current 2x4TB into it!)