Hi Fabian,
Thanks for the mail.
For security reasons we have not provided the option to disable the Database Backup feature in the UI level. But you can change the frequency to monthly so that only one backup would run in a month.
But if this also an issue and if you want to disable the DB backup permanently, then please send an email to us at passwordmanagerpro-support@manageengine.com. We will schedule a quick webex session and have our development team to assist you in disabling this feature.