Any suggestions for freedom respecting, low electrical power usage servers with 2-4G of RAM, supports, SATA and gigabit Ethernet, and can run Debian?
@alienghic those specs are met by many mid-range arm boards, for example the cubieboard.
Super low-power option. I run my offgrid house with one.
@joeyh Cubieboards look interesting, though their website is limited. I'd also forgot the name for the open source CPU core (RISC-V) and wasn't sure if that was actually usable yet.
Octodon is a nice general purpose instance.