Android Backup API

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http://stackoverflow.com – Can anyone explain what exactly the Android Backup API is used for? I have read Using the Backup API and Data Backup from the Developer Docs, but it is still unclear to me. When is data backed up & restored? Specifically in these situations: A user installs my app on Device 1, data is backed up, and the user then installs my app on Device 2. Is user data from Device 1 automatically put on Device 2? If so, does this occur when the app is installed or when it is launched? My app is installed on 2 devices. When a change is made on Device 1 is it automatically made on Device 2? If not, is (HowTos)