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angularjs - How to sync offline database with Firebase when device is online?

I'm currently using angularJS and phonegap to build a test application for Android / iOS.

The app use only text data stored in a Firebase database. I want the app to have its own local database (used when the device is offline) and sometime (when the device is online) sync with a Firebase database.

The offline mode uses the storage API of phonegap/cordova. Could I just check the device's online state and backup the online database periodically ?

Any clues on how I can achieve this ? Last time a similar question was asked, the answer was "not yet"... (here)... because it focused on a hypothetical Firebase feature.

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