Create a Disk Image & Restore It (Mojave / APFS)

First of all, Apple you SUCK!!!

Now, that's out of the way, here is how to create a disk image for APFS and restore it:

• Boot Mojave from an external USB (CMD + Option)
• Open Terminal
• Unmount the disk (disk0 is the built-in disk):
• diskutil unmountDisk /dev/disk0
• Create the image:
• hdiutil create -srcdevice /dev/disk0s2 -format UDZO /Volumes/100G/Macintosh_HD_Backup.dmg
• Scan the image
• asr imagescan --source /Volumes/100G/Macintosh_HD_Backup.dmg
• Restore the image
• asr restore --source /Volumes/100G/Macintosh_HD_Backup.dmg --target /dev/disk0s2 --erase
• When it asks to restore it to disk1, APFS, say 'y'.