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Duplicacy
What it is
Duplicacy is a file backup tool for Windows, macOS, and Linux that sends files to cloud storage, local disks, or SFTP servers, including computers and NAS boxes. It supports client-side encryption and deduplication. Encryption depends on the setup choice: users set a password when initializing storage to encrypt it, while an empty password leaves it unencrypted. Its lock-free deduplication design uses a two-step fossil collection process to remove unreferenced chunks without a centralized chunk database. The Web Edition supports backup, restore, check, copy, and prune operations, plus scheduling and email notifications; its dashboard displays storage and backup status. The CLI can be run manually or from scripts, and its source code is available on GitHub. CLI personal backups on a home computer are free, as are CLI restore, check, copy, and prune operations. The Web Edition downloads a fully functional 30-day trial license automatically when used for backups without a license. Paid license terms depend on use and computers: personal GUI licenses start at $20 a year for the first year, while commercial GUI and CLI licenses are $50 a year.
For and against
For
- Supports cloud, local disk, and SFTP destinations
- Client-side encryption is available
- Web Edition includes scheduling and email notifications
- CLI personal backups on a home computer are free
Against
- Encryption is off when storage is initialized without a password
- GUI licenses are limited to one computer
- Web Edition trial lasts 30 days
The verdict
Duplicacy offers both a Web Edition and a command-line option, with different license terms. Choose a storage password if you want encryption, and check the computer limits for the license you need.
Who it suits
Duplicacy suits people who need file backups across Windows, macOS, or Linux and want a choice of cloud, local, or SFTP storage. The CLI personal-use option is for home-computer backups; the Web Edition adds a graphical dashboard and scheduled operations.
Plans and prices
Personal License — first year
1 home computer
Read 20 Sep 2026 · duplicacy.com
Personal License — subsequent years
1 home computer
Read 5 Oct 2026 · duplicacy.com
Personal License — additional computer, first year
For additional personal-license computers
Read 5 Oct 2026 · duplicacy.com
Personal License — additional computer, subsequent years
For additional personal-license computers
Read 5 Oct 2026 · duplicacy.com
Commercial License
No personal-use limitation · Private ticket support
Read 20 Sep 2026 · duplicacy.com
CLI License
one computer · commercial backup use
Read 15 Oct 2026 · duplicacy.com
Personal GUI License
one home computer · personal files only · public-forum support
Read 15 Oct 2026 · duplicacy.com
Commercial GUI License
no usage limitations · private-ticket support
Read 15 Oct 2026 · duplicacy.com
CLI personal use
Free for personal use; personal file backups on a home computer
Read 3 Oct 2026 · duplicacy.com
On the record
- Backup operations
- The Web Edition provides backup, restore, check, copy and prune operations.duplicacy.com · read 15 Oct 2026
- Backup scope
- fileduplicacy.com · read 20 Sep 2026
- Command line
- The CLI engine can be run manually or from scripts and has published command references and build instructions.github.com · read 15 Oct 2026
- Company founding and headquarters
- Acrosync LLC is listed as an active New York company filed January 7, 2011, at 4 Annable Place, Clifton Park, New York.bizprofile.net · read 15 Oct 2026
- Computer backup
- Yesduplicacy.com · read 20 Sep 2026
- Credential protection
- Web Edition encrypts storage credentials with a master password and stores a derived token in the operating system keychain or keyring when available.duplicacy.com · read 15 Oct 2026
- Dashboard
- The Web Edition dashboard presents graphical status and storage statistics.duplicacy.com · read 15 Oct 2026
- Deduplication
- Its lock-free deduplication design uses a two-step fossil collection algorithm to delete unreferenced chunks without a centralized chunk database.duplicacy.com · read 3 Oct 2026
- Encryption
- Storage encryption is optional during initialization and uses a user-supplied password; leaving it blank leaves backups unencrypted.duplicacy.com · read 15 Oct 2026
- Encryption choice
- When initializing storage, users can set a password to encrypt it; leaving the password empty means the storage is not encrypted.duplicacy.com · read 3 Oct 2026
- HTTPS
- The Web Edition can listen with HTTPS and automatically obtain a Let's Encrypt certificate.duplicacy.com · read 15 Oct 2026
- Independent review score
- FAUN's independent comparison rated Duplicacy 71 out of 100 and described documentation as its weakest area.faun.dev · read 15 Oct 2026
- Integrations
- The user guide documents storage setups for Microsoft Azure, Dropbox, Google Drive, OneDrive, Wasabi, DigitalOcean Spaces, and MinIO.duplicacy.com · read 3 Oct 2026
- Latest CLI release
- The GitHub releases page lists CLI version 3.2.5 as latest and notes a OneDrive fossil-handling fix.github.com · read 15 Oct 2026
- License exceptions
- No license is required for CLI personal backups on a home computer or CLI restore, check, copy, and prune operations.duplicacy.com · read 3 Oct 2026
- License limits
- A GUI license is for one computer, while the CLI license allows one computer to run the CLI version.duplicacy.com · read 3 Oct 2026
- License renewal
- Licenses do not auto-renew; customers pay manually and receive an expiry reminder about seven days beforehand.duplicacy.com · read 15 Oct 2026
- License terms
- The custom license permits modification and redistribution, while non-trial commercial use requires per-computer licensing.github.com · read 15 Oct 2026
