Just strange that you don't support offline for web apps, only iOS & Android, even though web apps can use websql.

That's probably cause you're used to writing native iOS apps, but we're attempting a web app that works via phonegap across all devices from one source code base.

So for us storing all the data in Backbone collections isn't an option - models add too much memory overhead, versus native JSON objects.

As I understand multiple collections update independently of each other? How do you deal with relational data in that case?