Weekly offsite backup

I am trying to do the same, to a Synology DS209 NAS Device offsite. I tried the ABR10 FTP option of sending the files to the to the DS209 but the process timed out and did not recover. I tried ISCSI. And I was looking into setting up OpenVPN on the DS209, but that is not trivial, and more for a Linux user, which I am not more than a beginner at so far. Today I was able to access the DS209 over the WAN using a product called Putty, but not sure how I would be able to get ABR10 to send files to the DS209 over that tunnel yet.

There is a lot of information out there, I have researched for hours, but I haven't found a recommended general approach to this yet. On the Local LAN, my Synology DS209 seems to work welll with ABR10, but talking to it over the WAN gts complicated - because when I first tried to attach it via ISCSI, the Synology will not (by design per Synology tech help) broadcast it's WAN IP address - only the local LAN IP adress. So though it can discovered as a target, it could not be logged onto/connected to over the WAN.

I f anoyne know of a case study or a known way to send ABR10 files over the WAN to a Synology NAS (preferably DS209) please let chime in.

Thanks.