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Knives and Flowers asked What happens to a computer during a power outage?
After a power outage, why do computers retain information, whereas things like clocks reset themselves? Does it use a back up power source, like some calculators? If so, how long would this back up be able to prevent stored data loss?
And got the following answer:
Your computer's hard drive uses magnets to store information. Your RAM (and the memory on your clock) need to constantly be refreshed, because they aren't permanent but magnets don't stop working because the power went out. Your computer does have a tiny battery that it uses to count the time when the computer is off or the power is out- those usually last about 5 years. You'll be able to tell when that battery dies because every time your computer turns on, it will think it's January 1st, 1970. then it will double check with the Internet and fix itself.