Problem creating a backup volume for macOS Big Sur with CCC on a multiboot system

[SardusX]

Hi All,
I recently installed macOS Big Sur in a separate APFS volume alongside macOS Catalina on my system drive in a dual boot configuration using OpenCore Boot Manager. This is the system drive situation after installation:

Now, before updating both versions of macOS I thought about adding an APFS volume dedicated to the macOS Big Sur backup to the existing macOS Catalina backup bootable drive (a mechanical disk).
Using CCC (v. 6.0.2) and selecting the macOS Big Sur installation volume on the system drive as source and volume dedicated to macOS Big Sur Backup created on the backup drive as destination, however, at the end of the process, the macOS Big Sur "Data" volume does not appear in the Backup drive:

and also Big Sur backup does not appear in the OpenCore start menu.
What could I have done wrong?
Thanks in advance for Your help

 

[SardusX]

Update:
I think I solved (I'm testing ...) by selecting the "Legacy Bootable Backup Assistant" option by right-clicking on the "Destination" drive in Carbon Copy Cloner.
This, I believe, is an explanation of the problem and its solution:

Creating legacy bootable copies of macOS (Big Sur and later) | Carbon Copy Cloner | Bombich Software

bombich.com

 

[sriHacPro]

Ran into same issue. It seems Big Sur is a different beast for backups. I settled for "standard" backup.