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OS X Lion: Revert to a previous Mac OS X version

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Revert to a previous Mac OS X version

If you use Time Machine to back up your computer, you can easily revert to a previous version of Mac OS X if you experience trouble after installing an update.

Important: Reverting to the previous version of Mac OS X erases any changes you made to the files on your computer since you installed the new version of Mac OS X. To save new or revised files, copy them onto a different disk or back them up using Time Machine before you follow these instructions. Use Time Machine only if you’re reverting to a previous version of Mac OS X 10.5 (Leopard), 10.6 (Snow Leopard), or 10.7 (Lion), because Time Machine is not available with Mac OS X 10.4 or earlier.
  1. Choose Apple menu > Restart, and then hold down the Command (⌘) and R keys while the computer restarts.
  2. Select “Restore from a Time Machine Backup,” and then click Continue.
  3. Select your Time Machine backup disk.
  4. Select the Time Machine backup you want to restore. To restore your computer to the state it was in before you installed the new version of Mac OS X, choose the most recent backup.
  5. Follow the onscreen instructions.

If you backed up any individual files as described in the Important message above, you can restore them now. If you backed them up using Time Machine, recover them using the Time Machine application. (You can find the Time Machine application in the Dock or in the Applications folder.)

Last Modified: Oct 30, 2013
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  • Last Modified: Oct 30, 2013
  • Article: PH4340
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