You'll use the Recovery installer, rather than downloading it from the App Store.ģ. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. If you already have an external drive with OS X installed, start up from it. If Method 1 fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. You don't need a DVD if you're running OS X 10.7 or later.Ģ. Start up from the Recovery partition, from Internet Recovery, or from a local Time Machine backup volume ( option key at startup.) Launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You need an external hard drive to hold the backup data.ġ. There are several ways to back up a Mac that is not fully functional.
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