Is there a way to export historic billing exports to Big Query?
Yes — you can export historic Google Cloud billing data to BigQuery, but note:
By default, billing export only starts sending data after you set it up.
Past (historic) billing data is not automatically included.
To get older data:
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You may need to manually download past invoices or reports from the Cloud Console.
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Some organizations store past billing data elsewhere (e.g., CSV exports) — you can load those into BigQuery yourself.