How is it set up?
You create a BigQuery link in the GA4 admin settings, choose a Google Cloud project and turn on daily or streaming export. The export collects data from the date it is set up; historical data is not backfilled.
What to watch
On standard properties, the daily export has an event-count limit; large sites should check it. BigQuery has storage and query costs, so queries should be written efficiently.
Why it matters
It is the foundation for long-term analysis, user journey analysis and a marketing data warehouse. More detail: What is GA4, setup: GA4 consulting.
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