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<p>Contains the backup and restore functionality available to
applications. If a user wipes the data on their device or upgrades to a new Android-powered
device, all applications that have enabled backup can restore the user's previous data when the
application is reinstalled.</p>
<p>For more information, see the <a
href="{@docRoot}guide/topics/data/backup.html">Data Backup</a> guide.</p>
{@more}
<p>All backup and restore operations are controlled by the {@link
android.app.backup.BackupManager}. Each application that would
like to enable backup and preserve its data on remote strage must implement a
backup agent. A backup agent can be built by extending either {@link android.app.backup.BackupAgent}
or {@link android.app.backup.BackupAgentHelper}. The {@link
android.app.backup.BackupAgentHelper} class provides a wrapper around {@link
android.app.backup.BackupAgent} that simplifies the procedures to implement a backup agent by
employing backup helpers such as {@link android.app.backup.SharedPreferencesBackupHelper} and
{@link android.app.backup.FileBackupHelper}.</p>
<p>The backup APIs let applications:</p>
<ul>
<li>Perform backup of arbitrary data to remote storage</li>
<li>Easily perform backup of {@link android.content.SharedPreferences} and files</li>
<li>Restore the data saved to remote storage</li>
</ul>
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