What is Duplicati used for?

Duplicati is a free, open-source backup client that stores encrypted, incremental, compressed backups on cloud storage and remote servers. It is a good fit for encrypted offsite backups to cloud storage and scheduled backups of home or small office files.

Is Duplicati open source?

Yes. Duplicati is open source under a custom licence. Its source code is on GitHub at duplicati/duplicati and is written mainly in C#.

Yes. Duplicati is open source, so the software itself is free to use under the terms of its own licence.

Can I self-host Duplicati?

Yes. Duplicati can be self-hosted on your own server or infrastructure; there is no official hosted version.

What is Duplicati an alternative to?

Duplicati is an open-source alternative to Backblaze Computer Backup, CrashPlan, Carbonite and Acronis Cyber Protect. Other open-source alternatives to Backblaze Computer Backup include Kopia, restic and BorgBackup.

Is Duplicati actively maintained?

Yes. The most recent commit to Duplicati was on 2 October 2026. The project has 15k stars on GitHub.

Duplicati: open-source file storage & sharing

About Duplicati

Duplicati is a free, open-source backup client that securely stores encrypted, incremental and compressed backups on cloud storage services and remote file servers. According to its README it is licensed under the MIT license and available for Windows, macOS and Linux, and it is written in C#.

Data is encrypted with AES-256 or GNU Privacy Guard before it is uploaded. Only the first backup is a full copy, and later backups are differential to save bandwidth and storage. A built-in scheduler keeps backups current, and an integrated updater announces new releases. Supported destinations include Amazon S3, Backblaze B2, Box, Dropbox, FTP, Google Cloud and Drive, MEGA, Microsoft Azure and OneDrive, Storj, SFTP, WebDAV and others.

Releases are GPG-signed, and the project offers a forum, an online manual and several update channels from stable to more experimental builds. Because the backup client runs on your own machines and sends data to storage you choose, it suits individuals and small teams who want client-side encrypted backups without a vendor-hosted service.

Key features

AES-256 or GPG encryption before upload
Incremental and compressed backups
Built-in backup scheduler
Many cloud and remote destinations
Integrated updater with signed releases
Windows, macOS and Linux support

Good fit for

→Encrypted offsite backups to cloud storage
→Scheduled backups of home or small office files

Built with: C#
Tags: backup; encryption; cloud-backup; incremental-backup; sftp; webdav; csharp; cross-platform

Duplicati: questions and answers

What is Duplicati used for?: Duplicati is a free, open-source backup client that stores encrypted, incremental, compressed backups on cloud storage and remote servers. It is a good fit for encrypted offsite backups to cloud storage and scheduled backups of home or small office files.
Is Duplicati open source?: Yes. Duplicati is open source under a custom licence. Its source code is on GitHub at duplicati/duplicati and is written mainly in C#.
Is Duplicati free?: Yes. Duplicati is open source, so the software itself is free to use under the terms of its own licence.
Can I self-host Duplicati?: Yes. Duplicati can be self-hosted on your own server or infrastructure; there is no official hosted version.
What is Duplicati an alternative to?: Duplicati is an open-source alternative to Backblaze Computer Backup, CrashPlan, Carbonite and Acronis Cyber Protect. Other open-source alternatives to Backblaze Computer Backup include Kopia, restic and BorgBackup.
Is Duplicati actively maintained?: Yes. The most recent commit to Duplicati was on 2 October 2026. The project has 15k stars on GitHub.