One person, no funding.
* Both 'entrepreneurs' have strong personality, although they are quite different.
* Both have a simple, traditional pricing model: You pay for the service. End of the story. Tarsnap in particular uses 'picodollars'.
* Both have a very simple web UI.
* Both are pretty stable. You don't see "coming back soon" pages and 404 errors.
[3] I don't know if these two businesses can be considered startups. To me startup is something defined. Not very specifically, but not very loosely either. The feeling I'm getting reading HN is that any (self-perceived) modern or pseudo-modern tech-company that doesn't have reason to market itself as a structured corporation poses as a startup.