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Apple Computing Products:
macOS - Operating System
What Kind of backup TimeMachine do ?
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<blockquote data-quote="cwa107" data-source="post: 1348811" data-attributes="member: 24098"><p>I'm not at all clear on what transpired with your backup or restore procedure, but I'll explain a bit about recovery options with 10.7 and how Time Machine works.</p><p></p><p>When you install 10.7, it creates a hidden partition that contains the OS X installation media. You can not add anything to that partition, it's locked and hidden from the user. The only time it's accessible is when you hold down Command + R at startup. Although you can make a flash drive that contains the same OS X installation files, in general, it's not needed. Even if you format "Macintosh HD" (your system partition), the recovery partition remains. Apple has been very careful about isolating that recovery partition because 10.7 isn't sold on disc and they know they need an easy way to make the OS re-installable without media.</p><p></p><p>Time Machine is a backup service that copies mostly user data to an external drive. It will also backup revisions of that user data over time, so that you can restore many different variants of your files. The more space the external drive has, the more revisions of your data Time Machine can backup. Time Machine does not backup the OS, because it's assumed that if you have a catastrophic loss of data, you would reinstall the OS anyway. And following any install of OS X, the installer will prompt you to recover from a Time Machine backup, which will pretty much put your disk back the way it was prior to the loss.</p><p></p><p>Again, I'm not sure exactly what you did to get to the state you were in, but that's how the technologies work.</p></blockquote><p></p>
[QUOTE="cwa107, post: 1348811, member: 24098"] I'm not at all clear on what transpired with your backup or restore procedure, but I'll explain a bit about recovery options with 10.7 and how Time Machine works. When you install 10.7, it creates a hidden partition that contains the OS X installation media. You can not add anything to that partition, it's locked and hidden from the user. The only time it's accessible is when you hold down Command + R at startup. Although you can make a flash drive that contains the same OS X installation files, in general, it's not needed. Even if you format "Macintosh HD" (your system partition), the recovery partition remains. Apple has been very careful about isolating that recovery partition because 10.7 isn't sold on disc and they know they need an easy way to make the OS re-installable without media. Time Machine is a backup service that copies mostly user data to an external drive. It will also backup revisions of that user data over time, so that you can restore many different variants of your files. The more space the external drive has, the more revisions of your data Time Machine can backup. Time Machine does not backup the OS, because it's assumed that if you have a catastrophic loss of data, you would reinstall the OS anyway. And following any install of OS X, the installer will prompt you to recover from a Time Machine backup, which will pretty much put your disk back the way it was prior to the loss. Again, I'm not sure exactly what you did to get to the state you were in, but that's how the technologies work. [/QUOTE]
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Apple Computing Products:
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What Kind of backup TimeMachine do ?
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