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Kopia

Fast, secure backup tool with client-side encryption, deduplication, and a browser-based server UI

Alternative to: backblaze, crashplan, carbonite


About Versions (86)

v0.23.1

2026-06-16

A bugfix release that resolves a rare race condition potentially leading to data loss.

v0.23.0

2026-05-12

This release introduces a restriction on insecure unauthenticated server binds to loopback, updates storage provider mechanisms, and includes various general improvements and bug fixes.

v0.22.3

2025-12-02

This release fixes a compression dependency regression and adds support for passing options to localfs.

v0.22.2

2025-11-26

This release fixes a regression in rclone execution and includes updates to S3 versioned tests cleanup and CI/CD PR title options.

v0.22.1

2025-11-25

This release fixes an empty UI issue for some users and includes various internal improvements to testing, CI/CD, and parameter types.

v0.22.0

2025-11-18

This release introduces extensive maintenance statistics, improves CLI safety and progress visibility, optimizes file descriptor usage on Unix, and includes various bug fixes and general performance improvements.

v0.21.1

2025-07-22

Fixed a server scheduling bug and added Azure Federated Identity support for storage providers.

v0.21.0

2025-07-20

This release introduces human-readable sizes for kopia ls, a log suppression flag, periodic JSON progress for snapshot verification, and various general improvements and GUI test expansions.

v0.20.1

2025-05-26

This release includes various bug fixes for server notifications, snapshotting of network shares, and several improvements and code formatting updates for the GUI.

v0.20.0

2025-05-20

This release introduces snapshot diff statistics, S3 role assumption, Azure Blob certificate authentication, and enhanced policy creation options in the GUI.

v0.19.0

2025-01-24

Kopia v0.19 enhances notification support with new UI profiles, desktop notifications, and snapshot report notifications from servers.

v0.18.2

2024-11-21

Kopia v0.18.2 is a hotfix addressing repository server client compatibility, while the v0.18 release introduces notification profiles, maintenance improvements, and updated snapshot/restore reporting.

v0.18.1

2024-11-17

Kopia v0.18.1 is a hotfix for repository server client compatibility, while v0.18 introduces notification profiles, maintenance improvements, policy import/export, and various provider updates.

v0.18.0

2024-11-16

Kopia v0.18.0 introduces notification profiles, maintenance and manifest management improvements, adaptive progress estimation for snapshots, and policy import/export capabilities.

v0.17.0

2024-04-16

This release focuses on performance improvements through reduced memory allocations, moving index compaction to maintenance, and various bug fixes and dependency updates.

v0.16.1

2024-03-26

This release introduces Azure PIT support, experimental Windows volume shadow copy support, and UI font-size adjustments, while disabling the legacy API by default.

v0.16.0

2024-03-23

This release introduces Azure PIT and immutability support, experimental Windows volume shadow copy, and UI font-size adjustments.

v0.15.0

2023-10-22

This release includes GUI theme fixes, an improved scheduler algorithm for missed snapshots, CLI improvements, and various dependency updates.

v0.14.1

2023-09-18

Added a CLI option to run missed snapshots on start, fixed GUI dark mode, and resolved window bounds issues in multi-display environments.

v0.14.0

2023-09-16

v0.14.0 introduces cron-based snapshot scheduling, server-side retention policies, OTLP tracing, and various GUI and server improvements, including socket-activation and Unix domain socket support.

v0.13.0

2023-05-01

Version 0.13.0 removes CLI command shortcuts, drops support for Windows 7 and 8, regenerates the package signing key, and reduces memory usage when parsing manifests.

v0.13.0-rc2

2023-04-17

This release removes the deprecated 'snapshot gc' command, adds several unit tests, updates various dependencies, and improves CI/CD infrastructure.

v0.13.0-rc1

2023-04-11

This release introduces several new repository and snapshot features, updates the GUI and CLI, and removes support for Windows 7 and 8.

v0.12.1

2022-10-01

This release includes GUI icon updates, a fix for repository refreshes, server scheduling policy improvements, and dependency updates.

v0.12.0

2022-09-28

This release introduces error correction for blobs, a new upgrade CLI, AWS IAM support for S3, and various GUI and performance improvements.

v0.11.3

2022-07-11

This release includes various bug fixes for the CLI, GUI, and repository, along with dependency updates and improved in-process testing support.

v0.11.2

2022-07-07

This release includes UI upgrades, fixes for the directory browser and snapshot sizes, a panic fix for atomic operations, and dependency updates.

v0.11.1

2022-07-05

Fixed an issue where scheduling snapshots while ignoring identical snapshots was not working correctly in the GUI.

v0.11.0

2022-07-04

This release introduces several GUI and CLI enhancements, open telemetry tracing support, streaming upload capabilities, and various performance improvements across the repository and snapshot systems.

v0.10.7

2022-04-07

This release introduces storage capacity reporting, sparse file restoration, zstd-fastest metadata compression, and reorganizes local content cache to fix a bug.

v0.10.6

2022-03-07

This release introduces Google Drive support, improves upload performance via parallel directory traversal, and adds various GUI and CLI enhancements.

v0.10.5

2022-02-12

This release introduces several GUI enhancements for managing pins, actions, and deletions, along with snapshot retention fixes and dependency updates.

v0.10.4

2022-02-03

This release adds the ability to change retention parameters via the CLI, improves token expiration error handling in storage providers, and updates various dependencies.

v0.10.3

2022-01-31

Fixed a directory listing refresh issue in the GUI and cleaned up the CI/CD changelog output.

v0.10.2

2022-01-30

Introduces asynchronous repository connection on startup, persistence for blob-retention configuration, idempotent PutBlob API, and various CI/CD and storage provider improvements.

v0.10.1

2022-01-14

Fixed regressions in APT repository publishing and resolved an HTTP 400 error in the UI when the repository is not connected.

v0.10.0

2022-01-14

This release fixes a CSRF security vulnerability in the self-hosted UI, introduces server control APIs, and updates various dependencies.

v0.9.8

2021-12-26

This release includes provider updates for Azure and S3, performance improvements for snapshot creation, expanded test coverage, and the introduction of dark mode in the UI.

v0.9.7

2021-12-06

This release features a revamped policy editor, major UI improvements to the snapshot flow, enhanced logging with rotation, and various bug fixes for B2 and metadata caching.

v0.9.6

2021-11-21

This release introduces a token bucket throttler, the 'snapshot pin' command, OpenBSD instructions, and various bug fixes and dependency upgrades.

v0.9.5

2021-11-07

This release introduces logging policies, optimizes restore performance for WebDAV and rclone, and includes various server, maintenance, and CI improvements.

v0.9.4

2021-10-23

This release introduces SFTP password authentication, improves CLI snapshot migration and syncing, and includes various fixes for the UI, server, and epoch components.

v0.9.3

2021-10-18

This release includes various bug fixes for uploads, mounting, and UI, alongside new CLI flags and environment variables for actions.

v0.9.2

2021-10-15

Fixed a logging regression and improved the auto-update experience in the UI.

v0.9.1

2021-10-14

Version 0.9.1 improves memory usage and speed through optimized logging and includes minor enhancements for S3 and rclone providers.

v0.9.0

2021-10-08

This release introduces a new repository index format, content-level compression, and major performance improvements for splitters and large file uploads, alongside expanded provider support and CLI enhancements.

v0.9.0-rc4

2021-10-04

This release introduces AWS S3 storage class support, performance improvements for memory usage and caching, and various dependency updates.

v0.9.0-rc3

2021-09-27

This release includes performance improvements for object writer buffers, CLI compression benchmark limits, and various UI fixes for directory selection and result pages.

v0.9.0-rc2

2021-09-20

This release introduces custom blob store sharding, enhances CLI configuration handling, and adds shallow restore options to the UI.

v0.9.0-rc1

2021-09-11

This release introduces a new repository index format for improved performance and compression, enhances various cloud providers, and adds support for repository password changes.

v0.8.4

2021-04-26

This release fixes an invalid 32-bit ARM Docker build and addresses several cosmetic and functional UI issues.

v0.8.3

2021-04-22

Hotfix release addressing bugs in the CLI and Kopia UI regarding policy detection and path trailing slash behavior.

v0.8.2

2021-04-16

This release introduces significant performance and usability improvements, new features like Full Maintenance and Actions, and adds Apple Silicon support.

v0.7.3

2020-10-11

This release improves CLI usability by adding parallel restore performance, fixing symlink restoration, and enhancing logging and color control flags.

v0.7.2

2020-10-03

This release includes bug fixes for retention tags, checkpoints, and data races, alongside improvements to the WebDAV client, CLI error reporting, and test infrastructure.

v0.7.1

2020-09-24

Kopia v0.7.1 introduces performance improvements, Blake3 hashing support, new Linux and Windows package repositories, and various usability enhancements for the CLI and UI.

v0.7.0

2020-09-20

Kopia v0.7 introduces major usability, performance, and supportability improvements, including new Linux and Windows package repositories and experimental rclone backend support.

v0.7.0-rc2

2020-09-18

This release introduces experimental symlink support, parallel directory scanning for uploads, improved FUSE memory management, and machine-parseable logging.

v0.7.0-rc1

2020-09-14

Kopia v0.7 introduces usability and performance improvements, adds RPM, APT, and Scoop package support, and includes an experimental rclone backend.

v0.6.4

2020-09-02

Fixed an issue where index compaction could resurrect content entries during full maintenance.

v0.6.3

2020-08-22

Blob deletion is now disabled by default in version 0.6 unless the KOPIA_ENABLE_BLOB_DELETION environment variable is set to true.

v0.6.2

2020-08-16

Fixed an HTTP/2 deadlock by pre-reading the request body in the server.

v0.6.1

2020-08-13

Rolled back Electron to v7.1.14 to resolve crashing issues on Ubuntu.

v0.6.0

2020-08-11

Kopia 0.6 introduces significant performance and stability improvements, new provider support including Backblaze B2, repository maintenance tasks, and enhanced UI capabilities for multiple repositories.

v0.6.0-rc4

2020-08-07

This release includes several bug fixes for the policy manager, Windows chown support, and blob parsing, alongside a CLI repository auto-upgrade and dependency updates.

v0.6.0-rc3

2020-08-01

Fixed quick maintenance scheduling and standardized version number formatting in update checks and UI captions.

v0.6.0-rc2

2020-07-31

Fixed build issues for arm and arm64 architectures.

v0.6.0-rc1

2020-07-26

Kopia 0.6 introduces significant performance improvements, explicit maintenance tasks, Backblaze B2 support, and UI enhancements for multiple repositories.

0.5.2

2020-07-26

Kopia version 0.5 is released, featuring a fix for auto-updates in the UI.

0.5.1

2020-03-14

Kopia 0.5 introduces a desktop UI, expanded object storage support, improved encryption schemes, and a revamped build system supporting multiple OS platforms.

0.5.0

2020-03-08

Kopia 0.5 introduces KopiaUI, expanded object storage support, enhanced encryption schemes, and significant internal refactoring for better robustness and cross-platform build support.

0.5.0-rc1

2020-03-06

Kopia 0.5 introduces a desktop client, expanded object storage support, enhanced encryption schemes, and significant internal refactoring across the stack.

v0.4.0

2020-01-10

Introduces an experimental HTML UI, support for compressed objects based on policies, basic authentication for the server, and new snapshot override flags.

v0.3.0

2019-10-05

This release includes CLI subcommand renaming and refactoring, performance improvements for local filesystem scanning, and various bug fixes in content management and upload handling.

v0.3.0-rc6

2019-08-18

Updated GoReleaser configurations, disabled Google Analytics metrics, and added basic authentication tests and CLI options for WebDAV.

v0.3.0-rc5

2019-08-14

Fixed Google Cloud SDK installation on Travis CI via Makefile updates.

v0.3.0-rc4

2019-08-14

Introduces an SFTP storage provider, reconnect token support, and a new rewrite flag, while removing the ListContents API.

v0.3.0-rc3

2019-07-28

Introduces an SFTP storage provider, support for reconnect tokens, and separate packs for metadata, while removing the content.Manager.ListContents*() API.

v0.3.0-rc1

2019-06-23

Updated the 'cache set' CLI subcommand to support modification of individual parameters and updated the getting started guide.

v0.3.0-pre10

2019-06-10

This release introduces encryption with padding, a separate metadata cache, and several refactorings, while deprecating block format v0 and hashcache.

v0.3.0-pre9

2019-05-31

Updates include refactored hash and encryption handling, improved storage tests, and the removal of legacy block format and DYNAMIC splitter support.

v0.3.0-pre8

2019-05-16

Updated documentation for package verification and modified the release process via goreleaser and Travis CI.

v0.3.0-pre6

2019-05-16

Fixed the Homebrew repository name in the goreleaser configuration.

v0.3.0-pre5

2019-05-16

Updated release targets and Homebrew output, improved site search and links, and refactored error handling.

v0.3.0-pre4

2019-05-10

Replaced Slack links with invite links on the site.

v0.3.0-pre2

2019-05-10

This update includes a revamped website, license scan reporting, various Makefile and CI improvements, and an upgrade to Go 1.12.