I use a readynas. You can get them with various config.
how many bays
total storage
cpu
ram
and types/counts of ports.
Mine is a old rn316 unit. It has been running flawless for years.
For media it has
Plex media server
emby server
twonky server
for media on it I connect to it with firesticks using kodi . I don't use the dlna servers.
Caveat ,it says you can use mixed size drives but it will waste space till all the drives are the same size.
It supports up to 12 GB drives now ,mine is 10GB
I would suggest the second drive to be the largest you plan on because it is the redundant drive. At least for up to a 6 bay drive after 6 bays it uses 2 drives for redundant.
It takes like forever to sync a net new drive but adding files is extremely fast.
Also I use easeus plus the built in back up because it creates a PXE boot disk for each pc which works with win10.
The interface is great with several apps that can be installed.
If you have say a ESATA Sansdigital Towerraid it works if you get the readynas with a esata port for expansion.
Or just run a backup from the readynas to it if it is connected to say a pc
Also you can't just plug a drive in with data to copy to the other drives, it will format the drive so you must copy the data from outside the nas. Then you can insert the drive to be formatted so you can reuse it.
The default free os is linux but you can install other os systems like microsoft server.
You can use the product finder at:
https://www.netgear.com/home/products/c ... d-storage/FYI,
I still use the ex490 as a secondary backup of the clients.
They are a mix of home and pro of win 10