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Recovering from a catastrophic drive failure.
Authored by: deemery on Apr 26, '11 08:24:46AM

Apple strongly discourages (or maybe even prohibits now) using a bootable drive for TimeMachine. So when thinking about backup, the best thing to do with a new external backup drive is (a) partition it allocating a 20gb partition for the OS and the remainder of the drive for TimeMachine; (b) install the OS onto that 20gb partition (and then running all the updates against that partition.) I've found that you need to have at least 10gb of free space on a bootable partition after installing Mac OS X if you want to be able to easily run Software Update - those updates often require 5-7gb of free space on the drive to install.

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