This issue is a duplicate of  https://tracker.moodle.org/browse/MDL-85499 because the original was closesd in error.

—

For well-behaved cron job scripts, all routine information should be sent to STDOUT. And exceptional information and errors should be sent to STDERR.

But the PROBLEM IS that for the Moodle cron job, the backup process will send routine information to error output.

This results in unnecessary noise and emails getting sent to our admin.