> For the complete documentation index, see [llms.txt](https://doc.thordata.com/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.thordata.com/doc/faq/product-problem/dataset/standard-dataset/can-i-buy-historical-backfill-data.md).

# Can I buy historical backfill data?

Partially. Backfill depth depends on whether target pages remain publicly reachable; Thordata can re-collect surviving content within a specified time window and keyword scope and deliver it with collection timestamps. It cannot cover pages that were removed, login-gated, or paywalled, nor guarantee completeness for a given year. For these requests, validate coverage with a sample before committing to volume — see the [official site](https://www.thordata.com/?ls=community\&lk=proxyip).