ABR 11 Virtual Edition Backup Plan

I am new to ABR11 and wish to simply configure it to backup our server as follows:

FULL Backup on a Sunday and DIFFERENTIAL Backups on all other days of the week. I would like a full backup and all associated differential backups removed after the next full backup has been creaed.

I have configured the custom backup type as per the above schedule but I am confused about what I should select for Clean up archive to acheive the result I am looking for.

I have attached the screenshot of what I have configured and where I am stalled (basically at the retention rules section).

Can anyone offer any guidance?

Thanks,
Nick