How to Restore a Mac to an Earlier Date (5 Steps)

Connect your external hard drive to your computer by inserting the USB cable into the USB port.
Insert the Mac OS X Installation CD into your optical drive, and double-click the 'Install Mac OS X' icon.
Click 'Utilities' at the top of the screen once your computer opens the Installer window. Select 'Restore System from Backup' from the drop-down menu.
Click 'Continue' to proceed, and click the 'Time Machine Backup' volume icon.
Select the backup you want to use to restore your system, and click 'Next.' The backup restoration takes up to 45 minutes to complete, depending on the size of your hard drive. Click 'Restart' to restart your computer.
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