Duplicacy vs Kopia
Side-by-side comparison of features, pricing, ratings, and alternatives.
Duplicacy is a cross-platform backup tool from Acrosync LLC that backs up files to a wide range of cloud storage providers, local disks, and SFTP servers. Its core technical differentiator is lock-free deduplication, a chunk-based approach that avoids the centralized locking databases used by many other deduplication backup tools.
Kopia is a fast and secure backup and versioning system for files and directories. It provides a simple and efficient way to manage backups and versions of your data. Kopia is designed to be highly scalable and can handle large amounts of data with ease.
- Free command-line tool for individual, non-commercial backups
- Lock-free design avoids common deduplication database corruption issues
- Supports a very wide range of storage backends
- Source-available CLI adds transparency
- Fast and efficient backup and versioning
- Secure encryption to protect data
- Highly scalable and can handle large amounts of data
- Cross-platform and open-source
- GUI and commercial use require a paid per-machine license
- Steeper learning curve than simple consumer backup apps
- Interface is more utilitarian than modern consumer backup products
- Steep learning curve for beginners
- Limited user interface options
- May require additional setup and configuration
More alternatives & similar tools
Alternatives to Duplicacy
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Cross-platform cloud backup for personal files, servers, and MSP client environments.
The Verdict
AI-generated from listing dataBoth Duplicacy and Kopia are open‑source, cross‑platform backup tools with strong encryption, but Duplicacy adds a paid GUI and broader storage backend support, while Kopia is completely free with an API and larger community footprint.
Key differences
- •Duplicacy offers a commercial per‑machine GUI license; Kopia is fully free with no paid tiers.
- •Duplicacy supports many cloud backends (S3, Google Drive, Backblaze B2, SFTP, etc.); Kopia’s backend list isn’t specified.
- •Kopia provides an API and higher GitHub star count (13,687) indicating larger community activity; Duplicacy has no API.
- •Duplicacy’s lock‑free deduplication avoids database corruption; Kopia’s deduplication method isn’t detailed.
- •Support channels differ: Duplicacy uses community forum and email; Kopia offers email and GitHub Issues.
Pricing & value
Kopia is completely free; Duplicacy requires paid licenses for GUI and commercial use.
Ease of use / learning curve
Duplicacy has a web GUI for monitoring, reducing complexity for non‑technical users; Kopia relies on CLI only.
Features & depth
Duplicacy offers lock‑free deduplication and client‑side encryption across many backends; Kopia’s feature list is less detailed.
Integrations & ecosystem
Duplicacy explicitly lists integration with major cloud providers and SFTP; Kopia’s supported integrations are not specified.
Collaboration
Both are open‑source and can be used by multiple users, but neither mentions built‑in team features.
Scalability
Kopia claims high scalability and handles large data volumes; Duplicacy’s scalability isn’t quantified.
Support
Kopia offers email and GitHub Issues with a large community (13.7k stars); Duplicacy provides forum and email only.
Security & privacy
Both provide client‑side encryption; no differences in encryption algorithms are disclosed.
Choose Duplicacy if…
Technical users needing a GUI and many cloud storage options, willing to pay per machine.
Choose Kopia if…
Developers or IT pros preferring a fully free, API‑enabled solution with strong community support.
Common questions
Is there any cost to use either tool for commercial backups?
Duplicacy requires a paid per‑machine license for commercial use; Kopia is free for all uses.
Which tool offers a graphical interface for monitoring backups?
Duplicacy includes a web‑based GUI; Kopia provides only a command‑line interface.
Can I integrate backups with Amazon S3 or Google Drive?
Duplicacy lists direct support for Amazon S3, Google Drive, Backblaze B2, SFTP, etc.; Kopia’s backend support is not specified.