git-backup is a CLI tool written in Go that backs up all Git repositories from GitHub and GitHub Enterprise (including GitLab) to local storage. It uses the go-git library to perform bare or non-bare clones without requiring the git CLI. The configuration is driven by a YAML file that supports Go templating for environment variable injection. The tool discovers repositories via the provider APIs using configurable filters (owned, starred, collaborator, org member) and excludes specific repos or namespaces. Pagination is handled automatically. It supports Docker deployment with UID/GID mapping. The code is well-structured with clear separation of providers (GitHub, GitLab) behind a common RepositorySource interface. It is a focused, standalone backup solution that does not require external dependencies beyond the binary itself.