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The readme says it works with any "persistent backend such as a REST API or socket connection".

It looks like it tries to be backend-agnostic, and do the sync work on the client side.

I'm assuming - and this could be a bad assumption - but based on the continuing updates architecture, if client a changes model a, client b will see an update on model a. How does client b get notified of the change? Does it have some kind of fallback system ala socket.io? Is this not yet part of the project?

Backbone took a REST opinion, I imagine if you want something like you describe, they (or someone) will implement something like backbone.io.

https://github.com/scttnlsn/backbone.io

Judging by the chart on the site, it looks like each client polls the original model on the server, and infers changes by diffing it against the client's current copy.

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