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Save the values of the properties of an Map.
map.backup()
backup backs up the current state of the properties of an Observe and marks
the Observe as clean. If any of the properties change value, the original
values can be restored with [can.Map.backup.prototype.restore restore].
Example
var CanMap = require('can-map');
require('can-map-backup')
var recipe = new CanMap("Recipe", {
title: 'Pancake Mix',
yields: '3 batches',
ingredients: [{
ingredient: 'flour',
quantity: '6 cups'
},{
ingredient: 'baking soda',
quantity: '1 1/2 teaspoons'
},{
ingredient: 'baking powder',
quantity: '3 teaspoons'
},{
ingredient: 'salt',
quantity: '1 tablespoon'
},{
ingredient: 'sugar',
quantity: '2 tablespoons'
}]
});
recipe.backup();
recipe.attr('title', 'Flapjack Mix');
recipe.title; // 'Flapjack Mix'
recipe.restore();
recipe.title; // 'Pancake Mix'