You can enable this in /home/admispconfig/ispconfig/lib/config.inc.php ($go_info["server"]["do_automated_backups"]).
Falko, may I ask for an RFE here? If you change it in the script, with the next update of ISPConfig, this change is gone. I'd like to move this flag to be a setting from the GUI Interface and stored in the database... Can we put this in the bugtracker? Shall I do that or will you?
If I remember right, I've modified the updater to take care of previous settings in config.inc.php, so your changes shouldn't be lost. I think this was introduced in 2.2.6, 2.2.7, or 2.2.8.
