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Disk utility image of high sierra

Now I installed macOS High Sierra 10.13 GM candidate, and it works OK in my operational environment.

However I have a problem that I can not image the APFS system disk using Disk utilitu image function.

Usually I backuped the system disk using another macOS installed on the external disk or USB stick. When I backup the system, and switch to external macOS. Then I use Disk utility and backup the main system using image function (until macOS sierra).

But in case of High sierra, the above way became unavailable. As the previous system, I made the external High sierra (disk, USB), and switched to the external system. But by the Disk utility, the main High sierra (APFS) disk looks like as follows;

Disk device

  (container)        <--- can image

     (partition)       <--- can not image

As attached snapshots, I can not image partition (image button is grayed out), but  I can select the container .

I tried to image the container, but the operation failed as atteched snapshots.

I can not understand why this method (I used this method since my first mac!) become unavailable!

1) partition can nbe imaged.

2) container can be imaged

3)image failed

Please tell me how to backup the system using the above method or other method (time machine or utilities on market or free).

最后更新：2017-09-22 10:29:22

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