Simple idea: call a .saveLocally() method on some object of data and have it persist locally with localStorage (and/or with companion storage techniques #555)
Perhaps you load a blog post and want to be able to read it offline.
There could also be a flag to back all requests in localStorage.
Sorry if this doesn't make complete sense, but hopefully you catch my drift, I'm still learning the ins and outs of Ember.
an IndexedDB adapter for ember-data is on the roadmap
Closing since we're already working on something similar.