Duplicati vs Kopia
Duplicati and Kopia are both backup software. Duplicati is open source under a license set out in its repository, with 15k GitHub stars. Kopia is open source under Apache-2.0, with 15k GitHub stars.
Which to pick
- Pick Duplicati when
- You want scheduled encrypted backups of a PC or small server to cheap cloud storage with a point-and-click interface.
- Pick Kopia when
- You want restic-style backups with a GUI and built-in scheduling, for desktops or small servers.
Side by side
A backup client for Windows, macOS and Linux that makes encrypted, compressed, incremental backups to S3, B2, Google Drive, OneDrive, SFTP, WebDAV and many other destinations, managed through a web UI.
A backup tool for Windows, macOS and Linux with encrypted, compressed, deduplicated snapshots to local or cloud storage, with both a CLI and a desktop GUI.
It spent many years in beta and its local database has a history of corruption and slow repairs, so test restores regularly; part of the code is under a proprietary licence.
Still pre-1.0 in version numbering, and its repository format is specific to Kopia.
Usable
Production-ready
Desktop app, command line and self-hosted server (both)
C#, .NET and JavaScript
Go, React and Electron
Open source, license unclear on GitHub
Open source, Apache-2.0 (permissive)
GitHub could not read the license. Check it in the repository before reusing any code.
You can build it into a product you sell, as long as you keep its copyright notice.
15k GitHub stars (both)
Established: started 12 years ago, latest release v2.4.1.0_stable_2026-10-29.
Established: started 11 years ago, latest release v0.23.1.
Other comparisons
More backup software
Both sides were judged on 2026-11-06 from each project's README and GitHub data. License, age and popularity lines are worked out directly.