Currently the backup process do a full backup every 7 days, with no option to change that (confirmed by the tech support).

If you have a large amount of files then running the full backup this generates a huge spike in bandwidth usage and also affects the CPU load for an extended period of time (in my case 25% load for 2.5 hours).

I suggest to have an option in the control panel to specify the number of days between full backups.