I've got 20 invites left as well, if anybody else wants one...

This. It paints a unsettling picture for the future of general purpose computing.

As long as 'free for personal use' means 'closed source' then at least I would have a hard time trusting a tool backing up personal files into public cloud storage without transparency about how the crypto is implemented. I suspect that may also be the case for much of your 'personal use' target audience.

Since most HN commenters are concerned about the source code availability, we'll definitely reconsider the licensing model.

Please do!

The product & tech looks very promising. I'd hate to have to cross it off my shortlist due to trust issues.

Indeed please do! You're definitely scratching a very real itch here.

A thought: Do you think people would pay collectively (given the chance) like a fundraiser to publish the source, when a certain limit is reached? Maybe even pay the developer's bills that way? I wonder..

Does that mean that it now works on OSX without root?

Works for me. Had to build from source (couldn't find an OSX binary), but it compiled without a single warning, which is probably a record for something not OSX-specific. make install still requires root, of course, but it runs fine from the build directory.