The main idea is to split the code into 2 sets of classes: Models and Views. A Model is responsible to handle all data of specified component. It loads, saves and represents it for a View. A View is rather a controller to handle UI, render widgets and specify actions for a Model to provide any changes. You can use any front-end HTML templates system within Backbone Views.
As I said above, Backbone is just a set of approaches to organize complicated project in robust way and a bunch of source code to help with it.
Nowadays, there are a lot of businesses and startups are growing up in the form of Software as a Service (SaaS). Recently, Facebook giant bought Parse [http://parse.com] innovative startup in this field. Parse is a back-end as a service. It is not a ready to use product for the concrete client, but a service for software developers that can help a lot. It can speed up the development process and reduce costs, as it solves the problem with back-end or server side in the most cases the project needs. Parse fits to a demo or a prototype ideally, because the main goal here is to build first working version as soon as possible with minimum resources.