Duplicati 2.4.0.0

What Duplicati Is and Who It Serves

Duplicati is an open-source backup application (Duplicati 2) that provides encrypted, compressed, incremental backups for Windows, macOS, Linux, Docker, NAS devices, and headless servers. Released under the AGPL, it is aimed at home users, power users, developers, and small organizations that require cloud and local backups without vendor lock-in.

Core Features

• Broad backend compatibility: Native connectors for Amazon S3 and S3-compatible endpoints, Backblaze B2, Microsoft Azure, Google Drive, OneDrive, Dropbox, WebDAV, SFTP, FTP and local file systems, plus support for many object stores via standard protocols.
• Client-side encryption: AES-256 encryption performed locally with passphrase and key options; SHA256 integrity checks for tamper detection and data validation.
• Incremental block-based backups: Chunking and content-addressable indexing upload only changed blocks after the initial full backup, reducing bandwidth and storage.
• Deduplication: Content-based chunking avoids re-uploading duplicate data across and within backup jobs to improve long-term storage efficiency.
• Compression and retention: Configurable compression plus retention rules and versioning to manage storage costs and restore points.
• Flexible scheduling and automation: Built-in scheduler for hourly, daily, weekly or custom runs; can run as a Windows service, under systemd on Linux, or inside Docker for always-on environments.
• Multiple interfaces: Browser-based GUI for setup and monitoring, plus a CLI and REST API for scripting, CI/CD integration, and headless deployments.
• Restore and repair tools: Point-in-time restores, file-level and folder-level recovery, verification jobs, and database repair utilities to rebuild backup chains and address issues.

Installation and Configuration

Duplicati provides platform-specific installers for Windows and macOS, packages for common Linux distributions, and official Docker images. A web-based setup wizard guides destination selection, encryption, filters, retention and scheduling; advanced configuration is available via CLI or configuration files for automated deployments.

User Interface and Workflow

The web UI organizes job creation, schedules, logs and restores into clear sections with sensible defaults. Granular include/exclude filters, custom retention policies and templates accommodate complex workflows. The interface surface can appear dense because of extensive options, but inline help, documentation and community examples provide practical guidance.

Performance and Reliability

Incremental, block-based backups with compression and chunking reduce transfers to remote stores. Operational reliability depends on backend stability and maintenance of the local state database (SQLite). Occasional database corruption has been reported; the application includes repair and recovery commands to address many problems. Regular verification jobs and log monitoring are advisable for critical data sets.

Security and Data Integrity

Encryption is applied client-side so cloud providers retain only ciphertext. AES-256 encryption combined with integrity checks and signatures protects confidentiality and detects corruption. Because encryption keys are user-managed, appropriate key management is required to avoid loss of access to backups.

Supported Platforms and Common Use Cases

• Platforms: Windows (desktop/server), macOS, Linux distributions, Docker containers, and headless systems via CLI.
• Common use cases: Encrypted cloud backups for home users, developers, freelancers, small teams and organizations seeking an open-source, vendor-neutral solution.
• Less suitable for: Large enterprises requiring centralized multi-tenant management, commercial SLAs, hardware-integrated snapshots, or full-service vendor support—though Duplicati can be incorporated into hybrid backup strategies.

Limitations and Common Issues

• Database dependency: The local metadata database is central to operations; corruption can interrupt backups but often can be repaired with included tools.
• Scaling considerations: Very large datasets and very high-frequency backup schedules may require additional tuning, monitoring and periodic maintenance.
• Support model: Community-driven support via GitHub issues and forums; commercial support depends on third-party vendors or internal resources.

Community, Development Activity and Releases

Duplicati is developed on GitHub with public source code, issue tracking and releases. Ongoing commits, pull requests and updates to connectors indicate active maintenance. Documentation, release notes and deployment examples are maintained alongside the repository, and contributions are accepted from the community.

Licensing and Cost

Distributed under the GNU Affero General Public License (AGPL), Duplicati is free to use and modify. There are no subscription fees; users rely on community support or may contract third-party providers for commercial assistance.