title: Can I combine SharedPreferences and Firestore when saving data?
body: <p>I'm a beginner developer and I'm currently developing a Quiz app.
  Each Quiz contains 50 questions and I'm storing them using Room database.
  I've got Coins, Stars, and the score and number of finished questions for each Quiz (And also user's information) that I want to save.
  And I still don't know what is the best method to do that.</p>
  <p>I was thinking about combining SharedPreferences and Firestore to save user's progress and information, SharedPreferences to save them locally, and Firestore so that when the user signs in on another device, all his progress and information will be retrieved (and saved in SharedPref).</p>
  <p>(**Data will be saved in Firestore when the user only signs in with Google)</p>
  <p>Now my Questions is :
  Can I combine SharedPref and Firestore when saving data?   and is it a good idea to do so?
  if not, should I only use Firestore for that?</p>