Rsync command for offsite rolling backups

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http://serverfault.com – I've read alot of articles and tried to come up my self but couldn't, so need help with Rsync command for offsite rolling backups please. I have installed cwRsync(in VMs as a test run for now) on two Windows Servers(both 2008 R2) and would like to setup rolling backups of a folder(which contains many folders within) from server# 1 to #2 and vice versa. I would like to push full backups twice a week(8:00PM Monday & Thursday) and like to delete first backup when third is completed, and so on. (attached schedule as a PNG) So far I've transferred folder/files by running following in a .cmd (HowTos)