Please don't get me wrong, it was not my intention to compare the features of tarsnap to a 10 minutes hack. I am sure there is a lot of good work behind and it looks like great code and a great project. I am also sure that a lot of businesses would be happy to pay for your service if they were directly targeted for it.

But I have no doubt the reason while your revenue doesn't make you happy yet it is because hackers are not the right target for it. I do differential backup using encFS and dropbox; it's not even remotely as cool as tarsnap but it's free for now. You see my point?