vice</a>, which requires registration.  Go ahead and <a
  href="http://code.google.com/android/backup/signup.html">register here</a>.  Once
that's done, the service pre-populates an XML tag for insertion in your Android
Manifest, which looks like this:</p>
<pre>
&lt;meta-data android:name="com.google.android.backup.api_key"
android:value="ABcDe1FGHij2KlmN3oPQRs4TUvW5xYZ" /&gt;
</pre>
<p>Note that each backup key works with a specific package name.  If you have
different applications, register separate keys 