Show HN: Unix Permissions Calculator (Experiment with Backbone.js)

I wanted to learn how to use Backbone.js a while back but had problems grokking information from the docs and various tutorials.

This weekend I decided to buckle down and try to create a simple app with Backbone.js. This was the result!

I'm not really sure if I'm really using Backbone in the way it's meant to (I followed the Todo tutorial) but if anyone has any comments on how to improve on my Backbone code, I'd definitely appreciate it!