A little known fact about it is one of his replies is this:
we're in a similar space -- http://www.getdropbox.com (and part of the yc summer 07 program) basically, sync and backup done right (but for windows and os x). i had the same frustrations as you with existing solutions.
let me know if it's something you're interested in, or if you want to chat about it sometime.
Never mind that, your company is still awesome, and with Tarsnap now running on Windows (10) thanks to the 'Windows Subsystem for Linux' I'm sure it will do a lot better in the coming years.
Oh, I'm not worried about that... I don't think $1M/year is a sharp line dividing "success" from "failure". I decided a decade ago that my criteria for success were:
1. Staying in Canada,
2. Doing work which I found interesting and meaningful, and
1: https://www.tarsnap.com/about.html