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Duplicacy

Duplicacy

Cross-platform backup tool with lock-free deduplication and client-side encryption.

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Our Verdict

Best for

Technical users and MSPs who want deduplicated, encrypted backups across many cloud and SFTP destinations.

Skip if

You want a simple point-and-click consumer backup app rather than a more configuration-heavy tool.

What is Duplicacy?

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.

SpecificationsAI-estimated

deploymentDesktop App
open source✅ Yes
api available❌ No
support optionsCommunity forum, email
key integrationsAmazon S3, Google Drive, Backblaze B2, SFTP, and other cloud storage backends

Key Features of Duplicacy

Lock-free deduplication manages chunks without a centralized database, reducing corruption risk from concurrent backups.
Backups can target many storage backends including major cloud providers, local disks, and SFTP-accessible NAS devices.
All data is encrypted client-side before it leaves the source machine.
A web-based GUI presents backup statistics and status through charts and dashboards.
The command-line interface is available for advanced users and automation scripting.
The CLI source code is published on GitHub, allowing users to audit the deduplication and encryption logic.

Use Cases for Duplicacy

1

Backing up to multiple cloud providers

Send encrypted, deduplicated backups to several different cloud storage accounts from one tool.

2

NAS and SFTP backup

Back up data to a home or office NAS box over SFTP with client-side encryption.

3

MSP white-labeled backup

Service providers use white-labeling to offer Duplicacy-based backup under their own brand.

4

Scripted automated backups

Use the CLI in cron jobs or scripts for unattended, scheduled backup runs.

Pros & Cons of Duplicacy

Pros

  • 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

Cons

  • 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

Frequently Asked Questions

Is Duplicacy free?

The command-line version is free for individual, non-commercial use; the GUI and commercial use require a paid license.

What is lock-free deduplication?

It is Duplicacy's approach to managing backup chunks without a centralized locking database, reducing the risk of corruption from concurrent operations.

Which storage providers does Duplicacy support?

It supports numerous cloud storage services as well as local disks and SFTP servers.

Is Duplicacy's source code available?

The CLI version's source code is published on GitHub.

Pricing Overview

View full pricing →
Freemium

CLI (Personal)

0

Commercial License

$50/machine/year

Reviews & Ratings0.0

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Best For

💻Developers🏪Small Business Owners

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About the Product

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Platforms
WindowsMacLinux
Target AudienceTechnical individuals, IT service providers, and small businesses needing flexible encrypted backup

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