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"Restoring your entire system from a backup
If you are restoring a backup made by a Mac to the same Mac
Hold down the Command and R keys at startup to start the computer from the Recovery system. The Recovery menu that appears includes the option to restore from a Time Machine backup. If you are using Mac OS X Snow Leopard, start your computer from the installation disc. Then use the "Restore From Time Machine Backup" utility.
Note: If "You can't restore this backup because it was created by a different model of Mac" appears when restoring a backup that was made on a different Mac, follow the onscreen instructions. If you are trying to restore your backup from one Mac to another Mac, use Migration Assistant to transfer data from the backup instead, as described in the next section.
Migrating a Time Machine backup to a new Mac
When you get a new Mac, you can transfer all of your applications, files, settings, and other information from a Time Machine backup you've already made. When you start up your new Mac for the first time, the Setup Assistant asks you if you would like to restore from backup. If you've already set up your new Mac, you can use the Migration Assistant (located in Applications/Utilities) to do the same thing.
After Migration Assistant completes the transfer and you select your existing Time Machine backup drive, you will be prompted with "Inherit Backup History". Once selected you will be able to continue to use your existing Time Machine backup on your new Mac."
Hämtat härifrån:
http://support.apple.com/kb/ht1427