What Is Kopia?

Updated

Kopia is a fast, secure, open-source backup tool for Windows, macOS, and Linux. It creates encrypted, compressed, and deduplicated backups and stores them in the cloud storage you choose. It ships with both a graphical desktop app and a command-line interface, and it is designed to scale from a single laptop to large servers.

If you want an open-source backup client that works across desktop operating systems, lets you pick your own storage backend, and offers a GUI for everyday use plus a CLI for automation, Kopia is built for exactly that. If you need a fully managed service with no setup, or you only ever back up to a single vendor's proprietary cloud, this may not be the right fit.

What Kopia actually does

At its core, Kopia takes snapshots of your files and stores them as backups. Three properties define how it handles that data:

  • Encrypted — backups are encrypted, so the storage provider cannot read your data.
  • Compressed — data is compressed before it is stored.
  • Deduplicated — identical data is stored only once, which reduces space usage across snapshots.

The storage destination is not fixed. Kopia uses "the cloud storage you pick," meaning you supply the backend rather than being locked to one provider.

Interfaces: GUI and CLI

Kopia offers two ways to work with it, and you can use either or both.

Interface Best for What it does
Graphical desktop app Everyday use on a laptop or desktop Create snapshots, define policies, restore files quickly
Command-line interface Scripting, servers, automation Run backups and restores from a terminal

The desktop app is available for Windows, macOS, and Linux. The project publishes recorded demos of both the CLI (shown using Google Cloud Storage with pluggable encryption and compression) and the GUI, so you can see the workflow before installing anything.

Who it suits

Kopia's stated architecture is "secure and scalable," and the project positions it for a wide range of scales — "everything from small laptops to large servers." That makes it a reasonable candidate if:

  • You run a mix of operating systems and want one tool across them.
  • You already have cloud storage and want to reuse it instead of paying for a dedicated backup service.
  • You want a GUI for routine snapshots but a CLI for scheduled or scripted jobs.
  • You prefer open-source software you can inspect and contribute to.

It is a weaker fit if you want a turnkey hosted product with support contracts, or if you have no storage destination of your own to point it at.

How to evaluate it

  1. Check platform coverage — confirm Windows, macOS, or Linux matches your machines.
  2. Decide on your storage backend — Kopia does not supply storage; you bring your own.
  3. Watch the demos — the project's recorded CLI and GUI walkthroughs show the real workflow, including the CLI example using Google Cloud Storage.
  4. Try the interface that matches your use case — GUI for interactive snapshots and restores, CLI if you plan to automate.
  5. Join the user forum — the project points new users there to get started and to discuss features and issues.

Common questions

Is it free? The site describes Kopia as open-source software. No pricing details are stated on the page, so treat cost of any storage backend as separate from the tool itself.

Does it work on my OS? Yes if you are on Windows, macOS, or Linux — all three are listed for both the GUI and CLI.

Do I have to use a specific cloud provider? No. The page says you use "the cloud storage you pick," and the CLI demo illustrates this with Google Cloud Storage.

Can it handle more than a personal laptop? The project states it scales from small laptops to large servers.

Where do I get help? The user forum is the project's recommended starting point for usage questions and feature discussion.