FWIW, Tarsnap is both b2b and b2c. My best guess from eyeballing email addresses and talking to some Tarsnap users is that businesses are only 20% of Tarsnap users, although they account for about 80% of the total usage.

That's a real surprise to me! (was it to you?)

The way tarsnap is marketed I'd never ever expected it to be b2c, most private individuals I know outside of computing would have a very hard time understanding what it's all about without a lot of explanation. That's really interesting.

I didn't say that the private individuals who use Tarsnap are outside of computing. I know a lot of unix geeks. :-)

Ah right, of course, why didn't I think of that angle. That should have been obvious. To my defence I'll say I wrote that before my morning tea while on a holiday. Will try harder next time.

Freshbooks (indispensable to me), Mailchimp, Outright.com, Basecamp and Backpack. And those are just the ones I use for my day to day business.