![]() There’s app for that Unfortunately, you can’t make a clone merely by copying files from your startup volume to an external drive in the Finder. (Your Mac’s built-in features include Disk Utility, but sometimes you need a drive-repair app with more oomph.) Finally, having a clone is essential when upgrading to a new version of OS X, because it gives you the option to easily revert to your previous system (by erasing your upgraded-OS drive and then restoring from the clone) if compatibility problems arise. A clone also comes in handy for troubleshooting, because you can use it to run third-party utilities on your ailing drive. By contrast, even though Time Machine also backs up every file on your drive, restoring all those files to a new drive takes hours (or possibly days) restoring an entire drive from an online backup service takes even longer. A few moments later, you’re back up and running-and you can then repair (or replace) your main startup drive more or less at your leisure. You simply attach your clone drive, restart while holding down the Option key, select the clone drive in OS X’s Startup Manager, and press Return.
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