by Naaman Fallouh.
Hi,
Following the mysql log I found this:
2016-07-12 02:20:24 7f83ff2ab700 InnoDB: Error: Fetch of persistent statistics requested for table "moodle"."mdl_backup_logs" but the required system tables mysql.innodb_table_stats and mysql.innodb_index_stats are not present or have unexpected structure. Using transient stats instead.
Could this be a reason?! and if it's, shouldn't the auto-backup fails to start at all and not stops after backing up some courses!!??