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Duplicati is a free, open-source backup software used by individuals and technically minded users around the world on Windows, Mac, and Linux. It provides AES-256 encrypted backups, support for a wide range of cloud storage destinations, incremental backup scheduling, file versioning, and a web-based management interface, all within a configurable and flexible setup. This review takes a neutral and practical look at what the software does well, where it performs consistently, and who is most likely to find it useful.

For users who want control over where their backups go and how they are protected, Duplicati offers a level of flexibility that most consumer backup tools do not. Rather than locking users into a single proprietary cloud service, it supports dozens of storage destinations — including Amazon S3, Google Drive, Backblaze B2, OneDrive, FTP servers, and more — giving users the freedom to choose their own storage provider and manage costs independently.

Because Duplicati is open-source and free to use, it attracts users who are comfortable with some degree of technical setup in exchange for greater control over their backup strategy. This review examines how the software performs in practice, covering configuration, daily operation, and the types of users most likely to get value from it.

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What Is Duplicati

Duplicati is a free, open-source backup software that encrypts files locally before uploading them to a user-selected storage destination. The software supports a wide range of cloud storage providers and remote server protocols, allowing users to back up to the service of their choice rather than a built-in proprietary platform.

The software runs on Windows, Mac, and Linux, and is managed through a web-based interface accessible from a browser on the local machine. Users configure backup jobs by selecting source folders, choosing a destination, setting a schedule, and defining encryption and retention settings. Once configured, backups run automatically according to the schedule without requiring further input.

Duplicati uses block-based deduplication and incremental backups to reduce the volume of data transferred after the initial backup. Only new or changed data blocks are uploaded during subsequent runs, which keeps ongoing backup sizes manageable and reduces the time and bandwidth required for regular backup jobs. File versioning is supported, allowing users to restore files to a specific point in time by selecting from stored incremental snapshots.

Because Duplicati is open-source, it is free to download and use without a paid license. Users pay only for the storage they choose to back up to, which can make it a cost-effective option for those who already have cloud storage accounts or access to a remote server.

Key Features

AES-256 Encryption Files are encrypted locally on the user’s device before being uploaded to the chosen destination. The encryption key is set by the user and is not shared with Duplicati, meaning the software itself cannot access the contents of backed-up files. This applies regardless of which storage destination is used.

Wide Storage Destination Support Duplicati supports backup to a broad range of destinations, including Amazon S3, Google Drive, Microsoft OneDrive, Backblaze B2, Dropbox, FTP and SFTP servers, WebDAV, and other S3-compatible endpoints. Users are not tied to a single provider and can switch or combine destinations as needed.

Incremental Backups with Deduplication After the initial full backup, Duplicati uploads only changed data blocks rather than entire files. This reduces the size and duration of regular backup jobs and lowers storage consumption over time by avoiding redundant copies of unchanged data.

File Versioning and Point-in-Time Restore Duplicati retains incremental snapshots of backed-up data, allowing users to restore files to any point covered by the retained backup history. Users can configure how many versions to keep and how long to retain them based on their storage capacity and recovery needs.

Automated Scheduling Backup jobs can be scheduled to run at specific times or intervals, running automatically without user involvement once configured. The scheduler supports flexible timing options, from multiple times per day to weekly or custom intervals.

Web-Based Management Interface The software is managed through a browser-based interface on the local machine. This interface provides access to backup job configuration, run history, logs, and restore functions without requiring a separate desktop application.

Performance Review

Backup Speed and Efficiency In tested scenarios, initial full backups completed at speeds consistent with available upload bandwidth. Subsequent incremental backups ran noticeably faster, as only changed data blocks were uploaded rather than full files. Deduplication reduced storage usage effectively over time, particularly for backups containing frequently modified documents.

Encryption and Transfer Reliability In tested scenarios, the local encryption process completed without impacting backup completion times for typical file set sizes. Uploads to cloud destinations were handled reliably, with the software resuming interrupted transfers rather than restarting from the beginning when connection issues occurred.

Restore Process Restoring files through the web interface was functional in tested scenarios, with users able to browse backed-up versions and select specific files or folders for recovery. Restore times varied based on file size and connection speed. The process requires some familiarity with the interface, as it involves navigating backup snapshots rather than a simple file browser.

Setup and Configuration Initial configuration requires more steps than consumer-oriented backup tools, as users must select and authenticate a storage destination, configure encryption settings, and define backup scope and schedule manually. In tested scenarios, this process was manageable for users comfortable with software configuration, but may present a steeper learning curve for those expecting a guided setup experience.

Pricing & Plans

Duplicati is free and open-source. There is no license cost to download or use the software. Users are responsible only for the cost of the storage destination they choose to back up to, which varies depending on the provider and the volume of data stored.

Donations to the Duplicati project are accepted and help support ongoing development, but are not required to access any features. All functionality is available to all users without a paid tier or feature restriction.

Use Cases

Users Who Want Control Over Storage Destination Individuals who already have cloud storage accounts or access to a remote server can use Duplicati to back up to those resources directly, rather than paying for a proprietary backup service on top of existing storage costs.

Privacy-Focused Users Those who want encrypted backups where the backup provider cannot access file contents benefit from Duplicati’s local encryption model, which applies AES-256 encryption before any data leaves the device.

Linux Users Users running Linux who need a reliable, scheduled backup solution with cloud support will find Duplicati one of the more fully featured free options available on that platform.

Technically Comfortable Users on a Budget Those willing to invest time in initial configuration in exchange for a free, flexible, and fully functional backup tool are the primary audience for Duplicati, particularly if they want to avoid ongoing subscription costs.

Pros and Cons

Pros

  • Free and open-source with no license cost or feature restrictions
  • Local AES-256 encryption applied before upload, regardless of storage destination
  • Supports a wide range of cloud and remote storage destinations
  • Incremental backups with deduplication keep ongoing storage usage and transfer times low
  • Runs on Windows, Mac, and Linux

Cons

  • Initial setup requires more technical familiarity than most consumer backup tools
  • Web-based interface, while functional, is less polished than dedicated desktop applications
  • Restore workflow can be unintuitive for users unfamiliar with incremental backup structures
  • No built-in cloud storage — users must supply their own destination and manage associated costs
  • Active development has had periods of instability; checking release notes before updating is advisable

Who Should Consider This Software

Duplicati is well suited for users who want a free, encrypted, and flexible backup solution and are comfortable with some technical setup. It is particularly practical for those who already have cloud storage accounts and want to use them for structured, scheduled backups without paying for an additional service. Linux users benefit from the cross-platform support, which is less common among consumer backup tools.

Users who prefer a guided, hands-off setup experience or who are not comfortable configuring cloud authentication and encryption settings manually will likely find Duplicati’s learning curve challenging. Those with straightforward needs and a preference for simplicity may be better served by a consumer-oriented backup service. For users who prioritise control, encryption, and cost efficiency and are willing to invest time in configuration, Duplicati is a capable and well-regarded option.

Final Verdict

Duplicati delivers a genuinely flexible encrypted backup solution that gives users meaningful control over where their data is stored and how it is protected. Its support for a wide range of storage destinations, combined with local AES-256 encryption and incremental backup efficiency, makes it a credible choice for users who want to build a custom backup strategy without paying for a proprietary service.

The trade-off is a higher setup barrier than most consumer tools. Users who are willing to work through initial configuration will find the software performs reliably once running. For technically comfortable users on any major operating system who want a free, encrypted, and destination-flexible backup tool, Duplicati remains one of the stronger options available in this category.

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