> For a complete page index of the Captain API documentation, fetch https://docs.filesearch.dev/llms.txt?excludeSpec=true

# Sync

> Captain is a fully managed API for deterministic file search over unstructured data. Connect cloud storage (S3, GCS, Azure, R2), index files, and query retrieved chunks with metadata.

## Docs

- [Set Up Sync](https://docs.filesearch.dev/guides/sync/set-up.md): Connect a cloud storage source to a Captain collection and keep its files up to date automatically. Add one source or several, and Captain keeps the collection current as files are added, changed, and removed.