Yes. You can access it across the internet by ip address, but it is much easier to set up a free DNS so you only have to remember a website instead of the ip address. Once you do that, you have to forward the correct port on your router.
Due to my own ignorance on the subject, I assumed that linking by IP address was the way to access the data. My question is how do you link from a remote location across the internet to access files on the NAS?
I'll try to ask my cousin. He does not have this router (on his wish list too) but has a NAS set up and can access data. There is a way to watch torrents and pictures. I am sure it is the same concept with a different router.