This is my nas I built mostly for photo storage. I built it in this case because I thought it would be cool and it keeps a lot of the noise down. It's very optimized for power consumption, or at least as much as possible considering I built it out of extra parts I had lying around after my trips to my local recycling center. It consumes around 25 to 30 watts when running.

The servo on the power button is connected to a raspberry pi 2 that is running tailscale. I can connect to it via ssh and run a custom-made python script that uses the servo to press the power button. Once it does that, I then wait for it to boot up and tailscale into the nas directly and I am then able to access my photos from anywhere. This allows me to have the NAS on only when I need it to, and since the raspberry pi draws only 1.4 watts, I can leave that running all the time.