This doesn't answer your question but it's an interesting blog post written by the author of Carbon Copy Cloner
On Mon, Jan 17, 2022 at 1:02 AM John Moore <bigfish@pacbell.net> wrote:
My understanding is the Apple APFS drive format is designed to optimize performance on SSD media. It will update files with just the changes and pointers so the entire file doesn't have to be re-written. Over time this will lead to file fragmentation which isn't much of an issue on an SSD but can be for a spinning drive. I have an old iMac that I installed Mojave on a while back and it seems to have been slowing down performance wise.I've carbon copy cloned the internal startup drive to an external spinning drive partition that is Mac OS Extended journaled. I thought maybe by bouncing out and back it would in essence defrag the internal drive but it still seemed slow. I've now reformatted the internal from APFS back to Mac OS Extended journaled and I'm re=carbon cloning the archived drive back on to the internal in the old drive format.Does anybody know if my theory that CCC'ing the APFS internal startup drive out to an external partition will defrag what the APFS process does to break up files to avoid rewriting them completely? I'm thinking is CCC will clone back to the now Mac OS Extended journaled internal drive from here on out the fragmentation generated by APFS format will stop or be alleviated. It's an old computer but it seemed to slow a lot when I went up to Mojave in a progressive way just like I would expect fragmentation to manifest.John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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