\DBMS\MySql\mysql.exe"' is not recognized as an internal or external command - ALL Backups on various computers are failing with this error as of yesterday

As of January 1, I am getting this when backing up a instance: (works towards another almost identical instance… no changes to either client nor server known…)

10:27:15 PM : ERROR: Job execution error: mysql: [Warning] Using a password on the command line interface can be insecure.ERROR 1045 (28000): Access denied for user ‘xxxx’@‘xxxxx’ (using password: YES)‘s@s’ is not recognized as an internal or external command,operable program or batch file.

Related issue?