Phil Windley has written a piece about how Fargo aligns to something he calls Personal Cloud Application Architectures. I think the main point that Phil is making is that PCAA, of which he says Fargo is an example, allows users control over their data. As Dave says, there is no exporting of Fargo's data because it is written in a place where a user has direct access.

However, right now, Fargo has a dependency on Dropbox. If you don't have or don't want a Dropbox account, you can't use Fargo. Ideally, I think users should be able to specify Dropbox, OneDrive, Box, or Sync as their storage provider.

In order for this to happen, there needs to be an open API that all these providers use, similar to what Dropbox has implemented, so that developers can write and maintain one set of storage code. I don't now if such an API exists, and I suspect there isn't one because it would appear to be in the storage vendor's best interest to have a closed API that locks people into their service.