Database backup doesn’t work

Hi,

WHAT I DID
– I’ve disabled database backup and saved
– I’ve enabled database backup and saved

WHAT I EXPECTED
– an email with the database backup
– a record in the Logs > Notices table

WHAT HAPPENED INSTEAD
– no email has arrived
– no entries were recorded in the log

ADDITIONAL INFORMATIONS
– I’ve tried to activate the debug (ITSEC_DEBUG) and restore the ITSEC_Scheduler_Cron
– I’ve tried to create a db backup from the dashboard: it works here (email sent and log written)!
– I have other websites on the same server, with the same configurations and everything work correctly

Where could be the problem? How to solve?

The page I need help with: [log in to see the link]