Completely depends on where you are too, my NAS uses ~30W, which means ~22kWh in 30 days, which translated into local electricity costs are 53SEK or $5.39.
It has enough CPU (Intel Celeron J4125) to run my production loads, RAID1 16TB drives and 18GB RAM so it successfully hosts DNS, DHCP, Jellyfin, Vikunja and network shares. And I get the knowledge that it is all local and under my control.

Ratz was tending bar, his prosthetic arm jerking monotonously as he filled a tray of glasses with draft Kirin. He saw Case and smiled, his teeth a webwork of East European steel and brown decay. […]
The bartender’s smile widened. His ugliness was the stuff of legend. In an age of affordable beauty, there was something heraldic about his lack of it. The antique arm whined as he reached for another mug. It was a Russian military prosthesis, a seven-function force-feedback manipulator, cased in grubby pink plastic.

It’s part of the opening scene of the book. :)

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