Has anyone tested SMB based time machine backups in any of the various revisions of Big Sur? Direct change from Catalina to BS result in permissions issues generated by time machine. If you force the folders to inherit permissions, time machine will complain about missing features. Either way, time machine is completely non-functional. I've reported feedback and seen that others have the same issue, but no one I know has worked around it yet. Samba 4.11.6 from ubuntu 20.04 standard options in smb.conf like fruit:aapl = yes and fruit:timemachine = yes, as well as the proper vfs etc. It is configured properly, worked great in Catalina and all previous revisions.