[jmpwat]

3x NUCS, two 5th gen i3's and a 5th gen i5 all with 16 GB of ram. Running a proxmox cluster across them hosting a couple vms as container hosts to run all my services including grafana, prometheus, plex, tinytinyrss, calibre server, homeassistant, a reverse proxy and nextcloud. And then really whatever I'm playing with at the time, kubernetes, rocks, etc.

I also have a dell micro with a 6th gen i7 and 16GB ram I use as my primary windows machine, but previously it was hosting all the aforementioned services by itself.

I'd go with some kind of mini PC and an external drive or two, or direct attached storage rather than a synology