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Don't throw away your old PC—it makes a better NAS than anything you can buy
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
I have an old Intel 1440 desktop that runs 24/7 hooked up to a UPS along with a Beelink miniPC, my router, and a POE switch and the UPS is reporting a combined 100w.