Ah, then yes, I have the WD My Cloud set up as a NAS, and it is accessible by any device on the local network, even my Blu Ray player. The WD My Cloud also doubles as a Time Machine backup for one of my macs. I'm sure if you get a 4TB, it could back up multiple macs.
This is what I have:
https://smile.amazon.com/gp/product/B00EVVGAD0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 and it was $168... I'm sure there's a better version now out there.