Please tell me how to backup the system using the above method or other method (time machine or utilities on market or free). I can not understand why this method (I used this method since my first mac!) become unavailable! I tried to image the container, but the operation failed as atteched snapshots. But by the Disk utility, the main High sierra (APFS) disk looks like as follows Īs attached snapshots, I can not image partition (image button is grayed out), but I can select the container. When you see the boot selection screen as shown, release the option key. Hold down the option or alt () key on the keyboard and power on the device.
Plug in your macOS High Sierra bootable flash drive. As the previous system, I made the external High sierra (disk, USB), and switched to the external system. With the device powered off, disconnect any external hard drives and flash drives. Delete macOS Catalina: Apple menu > Restart > Command + R > Disk Utility > your startup disk > Erase. Then I use Disk utility and backup the main system using image function (until macOS sierra).īut in case of High sierra, the above way became unavailable. A powerful Mac OS X release, High Sierra 10.
When I backup the system, and switch to external macOS. Usually I backuped the system disk using another macOS installed on the external disk or USB stick. However I have a problem that I can not image the APFS system disk using Disk utilitu image function. Now I installed macOS High Sierra 10.13 GM candidate, and it works OK in my operational environment.
