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About the developer

1.3K Stars 93 Forks Apache License 2.0 2.0K Commits 161 Opened issues


Cross-platform backup tool for Windows, macOS & Linux with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication. CLI and GUI included.

Services available


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Contributors list


Kopia Build Status Slack GoDoc Coverage StatusGo Report Card Contributor Covenant


  1. copy, replica (Polish)
  2. lance, spear
  3. fast and secure backup tool

Kopia is a simple, cross-platform tool for managing encrypted backups in the cloud. It provides fast, incremental backups, secure, client-side end-to-end encryption, compression and data deduplication.

Unlike other cloud backup solutions, the user is in full control of the backup storage and responsible for purchasing one of the cloud storage products (such as Google Cloud Storage), which offer great durability and availability for the data.

Kopia in action


command line tool:


Kopia UI - experimental user interface

Kopia UI Tutorial

Getting Started

See Documentation for more information.

Building Kopia

See Build Infrastructure for more information on building Kopia and working with the source code.


Kopia is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.

Contribution Guidelines

Kopia is open source and contributions are welcome. For more information on how to contribute see the Contribution Guidelines.

Reporting Security Issues

If you find a security issue you'd like to disclose privately, please contact

[email protected]
or via direct message to maintainers on Slack.


Kopia is a personal project and is not affiliated with, supported or endorsed by Google.

Cryptography Notice

This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See for more information.

The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with symmetric algorithms. The form and manner of this distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.

Netlify Status

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