I just run on two mini PCs.

One running OPNsense, fanless N5105, 4x 2.5Gb, it doesn’t need much disk or memory but at the time it was a negligible additional cost to go to 16GB and 500GB.

The other is running Proxmox, on a Ryzen 7 7840HS, 96GB RAM, 500GB SSD, and with two 5TB USB HDDs plugged in (rotated with a third that I keep at a friend’s place as a cheap but fit for purpose offsite backup).

It’s just them plus a managed 2.5Gb switch and a couple of wifi routers in AP-only mode. It costs very little to run power-wise and is more than enough grunt for my needs.

I used sandpaper on mine, a few different grits down to a 2000 I think it was. Then applied a UV-resistant clear. It has gone well over 5 years now.