Duplicacy Command Line Version

It provides a command‑line interface for backing up files to a wide range of cloud storage services, as well as to local disks, SFTP servers, and NAS devices. The backup engine encrypts data on the client side and uses a lock‑free deduplication method that stores chunks without locks and includes a two‑step fossil collection algorithm to delete unreferenced chunks without a centralized database.

The tool is cross‑platform and runs on macOS, offering the same core functionality as the accompanying web‑based GUI. Users can invoke backup, copy, check, and prune operations manually or script them for automation, and the command line version is available as open‑source code on GitHub.

It is intended for individuals and IT service providers who need reliable, encrypted cloud backups with efficient storage usage. The source is freely available for personal use, while commercial deployments require a per‑machine license.