title: Overwrite file in my app
body: <p>When I start the application I will invoke a web service and save a file returned by the service in my app. For offline purposes i want to have a file in my app, in case the web service is down. </p>
  
  <p>My question is: I want to overwrite the file i have, with the file I received from the web service. How should i do this? Where should i save the files to be able to perform this task?</p>
  
  <p>I was saving the file received in my internal storage, but the offline file I don´t know where i should save it. Any code? Indications? New to this.</p>