Backup database results in error “Could not clear 'DIFFERENTIAL' bitmap in database”

I recently ran into yet another issue, where the error message had absolutely no relation to the final solution. When trying to back up a database, we were getting the following error: Msg 18273, Level 16, State 1, Line 1 Could not clear ‘DIFFERENTIAL’ bitmap in database ‘RS_newTempDB’ because of error 9002. As a result,…

12