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To perform a historical backfill from GA4 into BigQuery, follow these steps:

1. Create a BigQuery project: If you don't already have a BigQuery project, create one on the Google Cloud Console.

2. Enable the BigQuery export feature in GA4: In the GA4 admin interface, go to Data Streams, select your data stream and then turn on the BigQuery export feature.

3. Create a BigQuery dataset: In the BigQuery project you created, create a new dataset where the GA4 data will be stored.

4. Set up the GA4 data schema: Before loading the GA4 data into BigQuery, you need to create a schema that matches the GA4 data structure.

5. Configure the data transfer: In the Google Cloud Console, create a new data transfer to move data from your GA4 property to your BigQuery dataset.

6. Run the data transfer: Once you've set up the data transfer, run it to start pulling historical data from GA4 and loading it into BigQuery.

7. Verify data: After the data transfer completes, verify that the data has been loaded into the correct tables in your BigQuery dataset.

8. Schedule data updates: To keep your BigQuery data up-to-date, set up a regularly scheduled data transfer to automatically update your data.