Using Moodle 2.8.7, and checked forum post but not find any similar issue. It is that automated backups working when no users selected in backup configuration, but NOT completely working with users.
The backups process stops at some course (unfinished), then we clean temp/backups logs, we switch to no users and works fine again.
The process stops at every time in a different course (after backed OK some courses), at a different hour (always in downtime). It doesn't seem to be related to course size as big courses (50M) are correctly backed and then later at a smaller (10M) course it shows UNFINISHED.
Thanks in advantage