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I would recommend using a recent macOS system installed on an external drive and boot from there.Īlternatively, you can downsize the existing APFS container, create a new APFS container on your main disk and install a Oh, what to do if I don't have a secondary system? RecoveryOS resides in one of APFS Volumes in the container you want to image so this is not possible, I think (not tested). Better finish reading the article first.Ĭan I boot into RecoveryOS to do this DMG image? Before making image you might consider deleting all existing snapshots in all APFS Volumes in theĬontainer. You should see an available option to "Image from container diskN". It should have a name like "container diskN" and none of its volumes should be currently mounted. And then right-click the whole APFS container containing your

Left sidebar of Disk Utility.app switch to "Show All Devices". You must be booted into some other system than your main system. This can be done comfortably from Disk Utility.app.

Source DMG must not contain any APFS Volume with APFS snapshots. Play well with current Disk Utility.app, so you have to drop to command-line and force using legacy method of restoring the " APFS Volume Groups", a new feature introduced in Catalina does not Source of restore operation must be a synthetised disk mounted from the DMG. There are major tricks how to make it work, the second one quite recent and third one is its consequence: Trick 1 This information is relevant for Catalina (I'm currently running macOS 10.15.1).