I have an app that has been published since 2021 and Google Analytics already generated a lot of reports. I wanted to export all the data from the reports to BigQuery and I setup the link using their tutorial: https://support.google.com/analytics/answer/9358801?hl=en.
But all the data present in BigQuery is the data from the day after I setup the link between them.
Is there some way to export the previous data to BigQuery?
No, it is not possible to get historical data from GA4 to BigQuery. It starts exporting since you have setup connection.
I recommend to setup GA4 - BigQuery link at the same time you create GA4 property.