I'm looking into building or buying my first NAS, mostly to act as storage + plex but some other tasks like a VPN or a reverse proxy are also not excluded. I'd like to start with something relatively small with 2 to 4 drives and give myself the ability to upgrade to something with more bays and more oomph in the future.
For that reason, I'd like to avoid ending up in a situation like this one. If I understand correctly, a traditional RAID array would be out the question given how diff distros / hardware manufacturers handle those. Unraid seems like it would let me move drives between machines and add drives over time so on paper that OS fits the bill. I could even add drive of diff capacity as the cost/TB goes down over time which is icing on the cake (but not a must-have imo).
Q: are there other OSes or hardware solutions that would let me achieve that?