I have a 2TB WD Mycloud attached to my home network and it has worked just fine. I can access videos, music, pictures and other files from Smart TV, computer and phone .
Even watched a film from it once over a hotels WiFi using a Tablet plugged into the hotel TV.
Get a Qnap silent nas 251+ and 2 4Tb western digital reds and you are sorted, if one disk goes down the other still has all the info, been running mine for 2 years now 24/7
I've used a two disk system from Synology, it's quite an old one, a DS213, which I've had for over 6 years. Both disks hold the same data, i.e. they're a back-up to each other, so if one fails the other still has all your info. It's used as my home server, and works a dream. I recently had one of the disks fail, the DS213 gave an audible warning, I just removed the faulty disk live, and just slotted in a new disk, activated it in the Synology Disk Manager menu, all the data on the good disk just copied over. No drama and all my data was safe.
Truth be known, I have got both Synology and QNAP. They are both extremely competent and I wouldn’t want to have to choose between them. It is just that the QNAP was the replacement for the Synology because I thought the spec looked better at the time.
There is loads on YouTube about NAS’s if you have the time ......
Mine’s on top of a kitchen cabinet out of view. Useful if someone unsavoury comes calling to steal laptops/TV’s and anything else that takes their fancy.
I think I am right in saying that you can configure any NAS to mirror drives or share them. It’s all in the software and I do know QNAP and Synology can do it any which way.