Amount of backups stored

Hi, this is probably a super n00b question. But I just installed CWP6 on my server and I am configuring it, but when I look at the Backup configuration I can only set it to do monthly, weekly and daily backups, but nowhere can I set the amount of backups that will be stored.

I would for instance like there to be 4 months of monthly backups to be stored. How would I go about doing this?

currently you have one backup of each but you can create additional rsync cron of /backup folder for which you want to have additional backups even longer.