i really like this software-centric approach, but I am a bit stuck when it comes to the hardware. Are there some sources around servers that don't suck up too much energy and are fairly quiet? What CPU is a good all-round solution?
replies(1):
If you need more power: I had success with HP ProDesk Mini (or any other one-litre PC), you can get these second hand from like $150 and extend RAM and SSDs however you like. You can even pick processor / generation to fit your needs best. These can have consumption from like 30W if I'm not mistaken.
I have no experience with real and expensive server hardware, but most people don't need that for a homelab.