With the destination disk ready, and your startup disk's permissions verified, it's time to perform the actual backup and create a replica of your startup disk.
Perform the Backup
- Select the startup disk from the device list in Disk Utility.
- Select the 'Restore' tab.
- Click and drag the startup disk to the ‘Source’ field.
- Click and drag the destination disk to the ‘Destination' field.
- Select ‘Erase Destination.'
- Click the ‘Restore’ button.
During the process of creating the backup, the destination disk will be un-mounted from the desktop, and then remounted. The destination disk will have the same name as the startup disk, because Disk Utility created an exact copy of the source disk, down to its name. Once the backup process is complete, you can rename the destination disk.
You now have an exact replica of your startup disk. If you intended to create a bootable replica, this is a good time to ensure that it will function as a startup disk.
