macOS Big Sur 11.6.1 and Security Update 2021-007 Catalina

Since updating (ten days ago), Time Machine has not completed a backup on either the Time Capsule or the external drive. Time Machine has run on both, and apparently copied some files, but quit before completing the backup.

When making such a comment, it would be useful to Reply to the post that included the useful comments rather than replying to the thread.