I do have it set to run every 5 minutes, with the daily cron running at 00:00.
As a twist it seems to have ran last night and successfully email myself as well as invoice to clients.
However during the database backup we are now seeing the following:
05/18/2017 00:00
Cron Job: Backup Complete
System
05/18/2017 00:00
Cron Job: ERROR : Unable to unlock tables: HY000 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.
System
05/18/2017 00:00
Cron Job: Starting Backup Database Dump
System
05/18/2017 00:00
Cron Job: Starting Backup Generation
System
However no backup is being sent via FTP or email, both are enabled.
We use FTP over SSH (SFTP) however we have been using it for many versions without issues until now.