How to disable or delete a scheduled backup from command line

SYSTEM INFORMATION
OS type and version: CentOS Linux 7.9.2009 REQUIRED
Webmin version: 1.981 REQUIRED
Virtualmin version: 6.17 REQUIRED
Related products version: RECOMMENDED

Hello,
I’m using virtualmin to work as an AMI on AWS, for a load balance setup. So I have several instances running the same virtual servers. Some tasks shoud run only on one instance… and not all of them. I could manage to that for cron jobs but not yet for scheduled backs. All my instances are creating backups every night. I have a shell script that runs on boot and disables everything that should not run if I’m not running the “master” instance. So, how do I disable or delete scheduled backups using the command line? Or any other ideas?
Thank you

Anyone? Please?
How are scheduled backups configuration stored on virtualmin? A file? Maybe I could just empty this file?
Thanks