How to Restore a Disk Image in OS X
Frequently backing up your system is a great way to make sure important files aren't lost. If your Mac freezes or crashes, performing a factory reset with the OS X installation disk will wipe your hard drive of all data, but using a disk image allows you to retain your settings and files. The "Disk Utility" in Mac OS X allows you to create an image from a folder, DVD or an entire hard drive.
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Instructions
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Connect the external hard drive with a back-up image already on it.
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Insert your Mac OS X installation disc.
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Restart your Mac. Hold the "C" key as soon as you see the gray screen.
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Select a language but do not begin installation.
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Choose "Utilities" from the menu bar and then "Disk Utility."
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Select your Mac's internal hard drive.
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Click the "Restore" tab.
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Drag the Mac hard disk to the "Destination" box.
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Click on "Image" next to the source box.
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Navigate to the back-up image from your external drive. Click "Open."
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Click the "Restore" button. It will ask you to confirm by pressing "Restore" a second time. This will delete all files on your hard drive and replace them with those on the disk image.
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Type in your admin name and password in the pop-up box. If the disk image is encrypted, enter the password for the image as well. Click "OK," and restoration of the disk image will begin.
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Tips & Warnings
This will delete any files currently on your Mac. Be sure to name your backups with useful information, such as "mm/dd/yyyy Macintosh Backup." Creating backup images will use large amounts of hard drive space. Frequent backups will require an external hard drive.
