gistfile1.js

this.listenTo(this.model, 'change', this._onModelChange);

initialize: function()
{
  // Only save every second at most
	this._save = _.debounce(this._save, 1000);
},

_onModelChange: function()
{
	this._updateTotals();
	this._save();
},

_save: _.throttle(function()
{
	this.model.save()
}, 1000),