Nice, thanks. I don't use dropbox much, maybe to publicly post a file for a week or perhaps a resume longer term.

So, don't think I need this but will keep it in mind for NAT traversal or something like that.

without a requirement for a provider, accounts, fees or your data belonging to someone else

Sounds like it is not completely true if you need a server in the cloud as a prerequisite, though maybe I misunderstood.