I posted a message about this last night along with a link to a discussion of the issue on the Macrium forums, and maybe my post got removed as spam because of the link. But it causes a specific error when it tries using VSS to create a snapshot. Exiting Boxcyptor allows the backup to work as it normally does. If you Google the 'Macrium forums,' go to the 'Disk Imaging' board & open the thread with the subject 'Error 0x80042306 after updating to Widows 11 build 22000.348' to see the details.
Thanks