I decided to give CCC a try and downloaded the trial version this morning. After selecting the Source and Destination disks, I got a cautionary dialogue box warning that the Destination disk (just erased twice with Disk Utilty) had remnants of APFS files that could cause future issues such as inability to boot, et cetera.

However, it seemed to me that a true copy should have the correct filing system and, if I erased to go back to the old filing system (not sure if that's even possible), a full restoration would be a problem. That is, I'd be restoring with something other than what I had.

Anyway, I disregarded the caution and have begun a backup with the disk as wiped by Disk Utilty. Once it's completed, the first thing I'll do is see if it boots.

Meanwhile, as the Subject line says: "Call me confused". We have some CCC users in FTM and I'd be interested in knowing what they did.


ryck

"What Were Once Vices Are Now Habits" The Doobie Brothers

iMac (Retina 5K, 27", 2020), 3.8 GHz 8 Core Intel Core i7, 8GB RAM, 2667 MHz DDR4
OS Sonoma 14.4.1
Canon Pixma TR 8520 Printer
Epson Perfection V500 Photo Scanner c/w VueScan software
TM on 1TB LaCie USB-C