Backup script for Synology

I have 2 units of synology diskstations DS215j. I have 3 different LANs connected via internet and microtic routers (all have assigned public IP address but each network is accessible easily - i can use rdp [login to view URL], [login to view URL], [login to view URL] from any network). I have windows server running at ip [login to view URL] and 192.168.2.xxx. One diskstations address is 192.168.1.yyy. What I need: write script that copies 1 file from servers [login to view URL] and [login to view URL] to diskstation 192.168.2.yyy. It is not a solution to run scripts on windows servers as I have to protect diskstation from cryptoviruses so only one way backup.