Honestly, this is the right answer. I have a HP ProDesk 300 G3 mini (the mini version of the server the OP is using) running home assistant, syncthing, a bunch

Honestly, this is the right answer. I have a HP ProDesk 300 G3 mini (the mini version of the server the OP is using) running home assistant, syncthing, a bunch of other random 24x7 stuff, and the "server", router, and PoE switch powering two Wifi APs is drawing a grand total of 9 watts*. It just doesn't seem worth the effort to try and make this more efficient. * According to the UPS.