I had considered running a DIY for years, and eventually just caved and bought a Synology 1522+ NAS. It lets me run my Plex server and Matrix server, and it just handles all the config and updates for me easily.
The decision was that I wanted to backup my hobbies, not have backup BE my hobby.
To clarify, running Plex is easy; running Matrix is very NOT easy… But being a NAS was the easiest part, by far. Stick the drives in, turn on, follow the short manual that came with it to configure, and let it do its thing.