Assuming that you want to pull directory c:\backup on machine WIN_SOURCE to directory /var/backup on machine LINUX_DEST :

On WIN_SOURCE :

- Install cwRsync Server (without openssh component)
- Start RsyncServer service
- Add a new module to rsyncd.conf :

On LINUX_DEST :

path = /cygdrive/c/backup
read only = true
transfer logging = yes

- Use the command below to initiate rsync:

rsync -av WIN_SOURCE::backup /var/backup

NB! Keep in mind that the recipe above is suitable for operations within a secure network.