Ok, I checked the "EFIClone.sh" I HAVE been using and yes, it's yours from December of 2020; so I have switched back to that one.
But I am having the same problem, which is that the cloning process stalls. CCC is still running, the four "dots" are cycling and the "Time elapsed" is still climbing, but the "Comparing and copying files" progress bar grinds to a near halt. For example right now it's stopped on an SL-mobileMe.tiff file, it's been running for 15 minutes, and the "Data copied:" is only 116 KB!!!
If I wipe the DESTINATION backup drive and start from scratch, it WILL backup the entire drive. But on a subsequent clone run... well... this is what happens.
UPDATE: I MIGHT KNOW WHAT'S GOING ON. I am using a USB 3.0 docking station I have not used with the Hack before. The dock works fine on the same machine under Windows. I'm saying this because when I try to abort CCC after this issue, things get wonky. I have to end up Force Quitting CCC, and then when I try to eject the USB connected drive, it doesn't like that either, and fails to do so cleanly, or at all. FYI the dock IS connected directly to the back of the Z390, blue USB 3.0 port.