We are not understanding each other, I think.
It's not just passive backup that I want with Dropbox.
I want to access files, and add files to folders, and delete files, and share files, from multiple desktops and mobile devices.
If the given folder in dropbox (or the whole dropbox account) is encrypted as an image, it would not be viewable, much less able to be added to or deleted from, without vEsp3 installed on the current device, correct? If so, then I have no further need for espy because to use it is to give up on the current functionality of Dropbox.