Best practice for on/off line data synchronization using AngularJS and Symfony 2

Question

I\'m building a relatively complex and data heavy web application in AngularJS. I\'m planning to use php as a RESTful backend (with symfony2 and FOSRESTbundle). I have spent wee

Answer 1

https://www.firebase.com/ it's reliable and proven, and can be used as a backend and sync library for what you're after. but, it costs, and requires some integration coding.
https://goinstant.com/ is also a good hosted option.

In some of my apps, I prefer to have both: syncing db source AND another main database. (mogno/express, php/mysql, etc..). then each db handles what's its best with, and it's features (real-time vs. security, etc...). This is true regardless to sync-db provider (be it Racer or Firebase or GoInstant ...)