Kopia

Fast, open-source backup tool with encryption, deduplication and both GUI and CLI.

Open sourceSelf-hostableCloud storage and file sync services

Verified facts: 3 of 3
Alternatives ranked: 4
Approved reviews: 0
Visits sent from here: 0

About Kopia

Kopia is an open-source backup tool that takes snapshots of folders and stores them encrypted, compressed and deduplicated in a repository on storage you choose, including S3-compatible services, Backblaze B2, Google Cloud Storage, Azure, SFTP, WebDAV, rclone remotes or a local disk. It offers both a command-line tool and KopiaUI, a desktop app for Windows, macOS and Linux, which makes it more approachable than restic for people who prefer a graphical interface. Policies control retention, compression and scheduling per folder, and a repository server mode lets several machines back up to one shared repository. Kopia is free and maintained by volunteers. It is younger than restic or Borg, so some users are cautious about trusting it with critical data, and documentation is thinner in places. Performance on large data sets is a strong point.

Best for: Technical users wanting fast, encrypted backups with an optional GUI.

What works

Desktop app plus CLI
Fast deduplicated, compressed backups
Works with many storage backends

Why people leave

Younger project than restic or Borg
Documentation is thin in places
No commercial support

Top Kopia alternatives

See all 4

1
restic
Longer-established open-source backup with a similar repository model.
66.5
2
Duplicati
Open-source backup with a web interface and many backends.
62.6
3
Arq Backup
Polished paid app for Mac and Windows.
59.6
4
Backblaze Computer Backup
Hands-off unlimited backup with no repository to manage.
57.2

Why people left Kopia

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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Kopia: common questions

Is Kopia free?

Yes. Kopia is free, open-source software that you can host yourself.

Is Kopia open source?

Yes. The source code is on GitHub at kopia/kopia. You can also run it on your own server.

What platforms does Kopia run on?

Kopia is available for Windows, macOS, Linux and Self-hosted.

What are the best alternatives to Kopia?

The highest-ranked Kopia alternatives right now are restic, Duplicati and Arq Backup. See the full ranked list for pricing, platforms and verified facts.

See all 4 Kopia alternatives

Kopia facts

3 of 3 verified

Open source: Yes; Checked Oct 25, 2026kopia.io(opens source in a new tab); “Fast and Secure Open-Source Backup Software”
Platforms: Windows, macOS and Linux (GUI and CLI); Checked Oct 25, 2026kopia.io(opens source in a new tab); “Supports GUI and CLI on Windows, macOS and Linux.”
Backup format: Encrypted, compressed, deduplicated; Checked Oct 25, 2026kopia.io(opens source in a new tab); “Encrypted, Compressed, and Deduplicated Backups Using the Cloud Storage You Pick.”