Just go be clear, the internal is also APFS. Maybe Full Volume Clone will only be available later, when CCC is out of beta. At any rate, I'll contact tech support.

ADDENDUM: Apparently, that feature is only available in beta and it has several possible drawbacks. Read Performing a Full Volume Clone via Apple Software Restore (Beta)

Last edited by jchuzi; 08/01/20 12:10 PM.
Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365