There is no such thing as an incremental or differential backup in Moodle. The courses are always backed up completely. In the configuration of automatic backups one can choose to exclude logs - users - ..., but there is no option to backup up only the changed modules or users.
What is the scenario, when backup runs for the 2nd time having set the cron job to run every 5 mints. I am bit confused over whether it is incremental or full backup? This is very important as it is critical with the available space..
Many thanks again...
Backups are not created every time you run the cron job but they follow the scheme you create on the Automated backup setup page (Site administration->Courses->Backups->Automated backup setup). So you can only create 1 full backup every day, but you can also configure to keep the Maximum number of backups kept (default = 1).
Many Thanks for this info.
Currently my moodledata folder is 300GB in size. What is the scenario if I set automatic backup to Daily? As u said I set the Maximum number of backups to 1.