I have an open case (since 8/17....) on an issue where the WHD 12.4.1 automated backup process is silently failing. It runs each day, but generates a useless zero-byte file. Furthermore, the backup file aging process still runs, so soon you have a bunch of zero-byte files and no useful backup data anywhere.
The only workaround so far is to manually stop the WHD server process, backup the database with pg_dump from the command line, then restart the WHD server process.
The tech said they're investigating it as a bug; I'm not sure if it's just something in my environment or is more widespread, but I'd advise everyone to take a look at their automated backup files to check if it's working properly.