Auto backup before every update > how to configure number of backups to keep

Hi,
I use HUB > Automate with "Auto backup before every update" on.
I use Snapshot > Managed backups with setting "managed backups > keep 3 backups before removing older archives"
Now I look at list of backups on WPMU DEV cloud and there are 3 files full_backup-full.zip a 3 files full-backup-automated.zip

How can I specify to keep 5 files full-backup-automated.zip? (and still only 3 files full_backup-full.zip)

Thanks,
Jiri