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

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 a 3 files

How can I specify to keep 5 files (and still only 3 files