I've been running a HP ProDesk 600 g1 for years now. It's my NAS (using external storage), general purpose server and home assistant server. I initially bought

I've been running a HP ProDesk 600 g1 for years now. It's my NAS (using external storage), general purpose server and home assistant server. I initially bought it for other purposes, but it made sense to use it. It's not as power-hungry as "real desktops" due to its laptop power supply, and much more capable of running a bunch of docker containers than something like a Pi. Second-hand this kind of computers can be had for super cheap, many companies use them. I got mine for €100 many years ago, including a power supply and an Intel pro SSD of 512GB. For that price I can't get a recent raspberry pi with decent SD card and power supply. I guess I do pay some more in terms of electricity, but it's reasonably efficient and the extra performance makes up for it.