Can I direct a web backup to Duo? How?

This is a very basic question, but I can’t find an answer anywhere.

I just need to know whether it is possible to have a non-LAN application save to Live Duo. More specifically, I have a Wordpress site making internal backups that I would like to save on my Duo: the backup app can send files to any online location, so it should only be a matter of providing it with the Duo’s http address and user/password info. Still, I just don’t know how to go about it.

Can anybody please point me to a simple tutorial for that?