Hooking up an honest-to-God NAS to a router's USB port may limit its bandwidth. The USB port in the back of routers are less than "full throttle." Then it probably can't do JOBD. The more standard way of doing this is ethernet hook up, and find the best way for you to come in from the outside. Secured, via VPN. Non secured, open a FTP port etc. Your download/upload speed decent?