Ask HN: What are some fun projects to try out on a spare Linux file server?
Running home servers, I'm always worried about power use:300 Watt(average)/1000 * 24 hr  = 7.2 kw/hr per day7.2 * 30 * $0.14 (roughly tax, generation + distribution in my area) ≈ $30/month to run the machine.