I hope this is the right section. If not, please move.
I'm looking to be able to access (read and write) a networked external hard drive which is connected to a home router - specifically the Netgear WNDR3400, which has a USB port explicitly for this purpose - from outside the network, via the internet. This is for work purposes (specifically for a small business that I design for). Is this doable? I've been using Dropbox but that's proving too problematic as more and more files need to be managed. I would prefer it not be through software that has to be running on a computer, as there is no "machine" running 24/7 here besides the router itself.