Beautiful site. Is this Vuong's work? It's exceptional.

I can appreciate that you want your descriptions to be as accessible as possible, but I had trouble finding any technical details about your system. Do you have this information on your site? Is the source code available? If the answer to either of these is no, then I'd be extremely reluctant to trust you with anything important.

Also, am I correct in understanding that this is not a standalone service? Is this only usable with a dropbox?