Mac OS 11 Big Sur has set it up for backup software. New security features have meant that clone backups can no longer work as before, because they must use an Apple tool called asr that has been full of bugs, and can not copy the system volume without first deleting the entire backup.
The Carbon Copy Cloner released an update with Big Sur support as early as last fall, but competitor Superduper has chosen to wait, especially to be able to release a version that works on the new M1 Macs at all.
Now have one beta version of Superduper 3.5 finally released, something that became possible thanks to bug fixes in asr that Apple has added in the beta version of Mac OS 11.4.
Just like the Carbon Copy Cloner, you need to delete and copy the entire boot disk to create a 100% Superduper clone. If you make an incremental, so-called smart, backup, the system volume is left intact while changes in the data volume are reflected to the backup.
This has pros and cons, writes developer David Nanian. The advantage is that you can install a minor system update and let the backups continue, but then roll back to an older system version from the backup if something turns out to be wrong. The downside is that you have to boot the computer from the backup and update the system again to keep the backup and computer on the same system version.
In order to create and boot from a clone backup of a Mac with an M1 processor, it must be updated to the beta version of Mac OS 11.4, and David Nanian points out that it is still possible that the changes will not be released in the final version of the update.