title: saving google pub/sub messages in file or csv or mq
body: <p>I know that in google cloud pub/sub, message will be lost after 7 days regardless of their acknowledgement state. Is there anyway we can send and store those messages in a file or csv or mq even after 7 days. My aim is whenever publisher publishes message this message should store in other place also.</p>
  
  <p>Thanks,
  santosh</p>