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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.
In the fall/winter in northern areas it's free! (Money that would already be spent on heating).
Summer is a negative though, as air conditioning needs to keep up. But the additional cost is ~1/3rd the heat output for most ACs (100w of heat require < 30w of refrigeration losses to move)