This is simply a question of survival for someone who depends on her/his computer for important or even vital matters. However, please, take note that I am talking of the need to have a VERIFIED backup clone of the system disk. So I am a bit at a loss and am not doing backups right now. The restore and image features in Disk Utility error. How can this be done? I tried to drag/drop but that doesn't work. I would like to restore the drive from scratch but need to get the TM backups over to another drive. Unless there is something wrong with the drive it self (Disk Utility's First Aid tool says there are issues with the drive but Disk Utility in Recovery mode says the drive is ok) I wonder if this is just one more problem introduced by Big Sur which seems to be the worst upgrade in years. The LaCie drive seems to be ok, it has the latest firmware driver. I am starting to fear it will get worn out. Unmounting the TM volume resolves the situation but of course that is not a solution. Culprit looks to be a lot of mdworker processes. Whenever it is mounted it is constantly spinning (literally for hours). I never had any issues with Catalina and an older drive but this combination seems to be causing problems. I installed it just after having installed Big Sur at the time. How clone a Time Machine backup APFS volume? I have a three months old external LaCie D2 Professional drive with two volumes, one being a TM. At best, when told to, it verifies checksums on previously saved files, which, while good, is still not enough. I'm aware that some third party backup softwares say they can create such a clone (I do have CCC V5, but haven't yet tested this feature with APFS system disks, it's still on my "to do" list), but even CCC does not perform a complete "Verify" pass on its target volume. So the question is: "How can one clone an APFS system disk with DU and obtain a bootable clone"? There's no way I'm ready to do production work on a system where I can't clone the system disk and obtain a verified bootable copy of my system as a fallback system disk in case of a problem with the internal disk. For information, the target disk is a newly created APFS partition on an external Thunderbolt/USB3 rotational disk (most of the other partitions on this disk are still HFS+), if this is relevant to the issue. Then I'm left with a useless target volume, only good to be reformatted. DU informs me that "APFS inverter failed to invert the volume - Invalid argument" and then "OSStatus error 22". Then, the target volume inversion fails (by the way, what on Earth is this "target volume inversion" and what is it needed for?). But when trying to clone an APFS system disk, the works progresses smoothly until the last step. Using Disk Utility to clone an APFS data disk works fine, without any issue. And I still can't envision moving to it with an SSD system disk, as I haven't yet been able to figure a way to clone an APFS system disk with Disk Utility. It's been now a while I've been doing tests with High Sierra (10.13.5 recently).
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