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CRASHES
Viruses, worms, Trojan horses, and hackers can destroy your system with no notice. Furthermore, as your operating system becomes older, it tends to become buggy, and it can shut down. Technically speaking, "crashing" a computer refers to the hard drive failing, but it can also mean a board burning up. Over time, it has come to mean any time your computer shuts down without notice.

You should assume that your computer is going to crash. Maybe you get hacked and your computer ruined, or your copy of PhotoShop overloads the system and shuts you down, or maybe you suffer a brownout. It does not matter much why the system shuts down, the question is how do you protect yourself?

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