Thanks for your tips and answers Ken. I'll think about what would be a good solution to make the automated backup
work good again. I already saw that an update of nextstarttime or truncate of the mdl_backup_courses could cause
serious problems with performance and a huge number of courses that would be backup-ed in a job of the
automated backup.
Do you use the automated backup task that runs every hour in the cron job of Moodle? We use this task too,
and I see that sometimes backups aren't finished when run during heavy workload of the site.
Maybe this subject could be worth overthinking by the developers how to handle these questions to organize your
backup strategy with a large number of courses and possible risks while scheduling a backup without causing
performance problems on your site. A mistake is made easily and you don't want to be called as administrator when
your site is not reachable anymore because of a heavy workload of your automated backup task that has run out of
scheduled time.
by Alain Raap.