Cloning is a destructive process that will erase the recipient drive, leaving the source drive intact.
The instructions below are for cloning from the original drive externally to a new drive inside a computer. In certain circumstances connecting the original drive externally is not an option. In those cases using an external hard drive as an intermediate is recommended. This process would consist of cloning the original drive while still inside the computer to a separate external hard drive, then installing the new drive and cloning the external hard drive to that new drive.
Power on the Mac while holding down the 'Option' key. This will display a boot menu that looks like the picture below. Click the drive icon that says 'Recovery' (OS 10.7 and later) or 'Mac OS X install' (OS 10.6.8 and earlier).
bootable drives in your system.
- Select the new volume (indented icon) and click on the 'Restore' tab.
- Drag the old volume to the Source field.
- Drag the new hard drive to the 'Destination' field.
- Click the check box for 'Erasing destination.'
- Click 'Restore' at the bottom to begin the process of copying your data to the destination.
You can also restore one volume from another volume. When you restore from one volume to another volume, it makes an exact copy of the original. For example, you can restore from your startup volume to an external volume to use as a backup.
- Select the new drive volume in the sidebar then click the Restore button or choose Edit > Restore. This is the volume that is erased and becomes the exact copy.
- Click the 'Restore from' drop down menu, then choose the volume you want to clone the data from.
- Click Restore. Once the data has been cloned, Disk Utility indicators will show the status as being 'complete'. Click the 'Done' button.