i think the best thing to remember here is that you want to K.I.S.S
Keep It Simple Stupid
i agree with everytihng dalek has said, a QNAP/Synology will do what you need it to do PLUS they have some very simple and easy to use modes on them so that you dont need to be a GURU to set it up.
if for whatever reason you can't do that, then i'd be looking at running Windows Server Essentials:
https://docs.microsoft.com/en-us/windows-server-essentials/get-started/get-started
it's somewhere in between the NAS option and the "proper" server option, it simplifies a lot of things
the opther thing to bear in mind is that with this centralised server setup you introduce a single point of failure, all your data is on this one server and if it breaks, everything breaks.
for this reason make sure whatever you use had redundancy! and backups! hard drives fail... its not a case of if, its a case of when... make sure at the MINIMUM you go for a solution with redundant drives. make sure youre in a position so that when it breaks your biggest stress is getting the thing up and running as quickly as possible, as opposed to worrying about writing your CV when you realize the data is lost forever and the company's about to go bankrupt!
Varun Kamath got a reaction from Enderman in How to power all my drives?
