title: BigQuery + PlayStore +Apps History data
body: <p>we are working on to integrate our apps data to BigQuery. as a part of that we are using BigQuery Transfer service to bring in the apps store data.
  I think the way the scheduled transfer works is, from the day we set up it would begin to bring in any new incremental data from there on which works for future data set.</p>
  
  <p>we also have existing data that we want to use along with the latest+future data. when i use the "schedule backfill" option here i can go and bring in any previous data except that when i use the existing data set it seems to wipe off the current dataset.</p>
  
  <p>Also at a time you can only schedule for 6 months of data.. we can create new dataset and try custom merge etc.. but i was wondering are there any other way how i can keep the previous and future data in single data set without writing any custom code/configs. </p>