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Take Control of Mac OS X Backups by Joe Kissell

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Live Dangerously: Hack Time Machine

Please pay attention to this word of friendly advice: don't mess with your backups. They are there to protect you, but they'll only do that if the data starts and stays perfectly intact. If something goes wrong with your backups—perhaps something subtle that you don't notice for weeks or months—you could be out of luck when it comes time to restore your data. Using unsupported hacks is courting trouble; it's encouraging things to go wrong. So, please be aware of the following:

I do not recommend hacking Time Machine, and will not provide help, support, or consolation if you try something in this section and it causes your computer to melt into a huge blob of goo. And you shouldn't even read these instructions ...

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