Adding and Removing Models
Let's take a look at how you can add or remove models from collections. Backbone provides a variety of flexible methods to achieve this. It's important to remember that a model may be in several different collections at the same time. Collections usually contain a filtered subset of the data in your database, so adding and removing models from a collection is not equivalent to adding and removing data from your database. This is an important distinction between models and collections. Models usually have a direct mapping to the data in your database. You would normally persist changes in your model data to the server.
You can add existing Backbone Models or raw objects to Collections. Raw objects will ...