If you have done so successfully, you will see what appears to be a white lightning bolt on the screen.
On the target Mac, reboot the computer while holding down the T key on the keyboard to boot it into Target Disk mode. The procedure below is for Yosemite (10.10) and earlier. More details at Cloning an image using Thunderbolt and Disk Utility (post–El Capitan) Note: If you’re using El Capitan (10.11) or later, the procedure has changed. For example, if you are imaging from 250 GB to 250 GB, that’s okay if you’re imaging from 250 GB to 500 GB, that’s also okay but if you’re imaging from 1 TB to 500 GB, that won’t work. The main hard drive partition of the source Mac must be equal to or lesser in size than the target Mac hard drive. Then, when you see the hard drive icon appear on your desktop, you can rename it. Easiest way to do this is to go to Finder > Preferences and then check or tick Hard Disks under Show these items on the desktop. 
Rename the hard drive on the source Mac to something unique (don’t call it Macintosh HD, which is the default). You can go straight from computer to computer with just a Thunderbolt cable. You don’t have to network your computer, install additional software, or have an external hard drive. Sure, you probably paid money for your Macs, but this method uses only included software… and one US$40 cable. 
Over Thunderbolt, cloning a roughly 30 GB (of used space) image takes only a few minutes. Updated March 2020: Updated for MacBook Air. Any questions?ĭo you have any questions about how to clone your Mac so you can use it as a backup? Put them in the comments and I'll help you out. Now, you can use the clone to restore files to your partitioned drive.
Select the external drive with the clone backup on it from the list of systems to start up your computer. Hold down the Option key as soon as you hear the startup chime. Be sure to do that before following the steps below. Important: You'll need to partition your hard drive in order to boot your clone as a separate startup disk. If you want to work on your backup on another computer while it's in the shop, you can boot it up from the startup menu. Once the backup has finished restoring, restart your computer. Select your Mac's hard drive next to "Restore to.". 
Select your external drive next to "Restore From.".Click on the Restore tab at the top of the Disk Utility window.Click on Disk Utility and then click continue.Your Mac will boot to the macOS Utilities screen. Hold down the Command and R keys as soon as the system restarts to enter Recovery Mode.Connect your external drive into the appropriate port on your Mac.If there is any reason you end up needing to restore your Mac from a backup, you can use a clone to do so.
If you don't understand the process for the program you have chosen, refer to the user guide. Most cloning programs will operate the same, general way.
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