title: Activity state instance - insights?
body: <p>I have a question regarding where the saved state instance of an activity is stored, internally.
  Since it's possible to restore even when the process is killed, I expect that Android OS stores the data somewhere else (other than app's process memory space).</p>
  
  <p>I'm asking because I have a sessionId (in app memory only) which is sensitive and I have a requirement not to store it in permanent storage.
  Would the state instance of the Activity fall under this category? </p>