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Absolute FreeBSD, 3rd Edition by Michael W. Lucas

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5READ THIS BEFORE YOU BREAK SOMETHING ELSE! (BACKUP AND RECOVERY)

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The most common cause of system failure is those pesky humans, but hardware and operating systems also fail. Hackers learn new ways to disrupt networks and penetrate applications, and you’ll inevitably need to upgrade and patch your system on a regular basis. (Whether or not you will upgrade and patch is an entirely separate question.) Any time you touch a system, there’s a chance you’ll make a mistake, misconfigure a vital service, or otherwise totally ruin your system. Just think of how many times you’ve patched a computer running any OS and found something behaving oddly afterward! ...

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