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2 more ways to get Duplicacy
Package managers
- winget
winget install --id acrosync.DuplicacyWeb - Chocolatey
choco install duplicacy
About Duplicacy
Duplicacy's distinguishing trick is lock-free deduplication: multiple computers can back up to the same cloud storage and share deduplicated chunks without talking to each other or to a coordinating server. The approach was published in a paper accepted by IEEE Transactions on Cloud Computing.
It also stores chunks individually rather than packing them into larger files with a database to track them, which means any storage that can do basic file operations works as a backend, and a corrupted index cannot take the whole archive with it. The command-line version is free for personal use; the web interface front end is a commercial product.
Strengths
- Several machines can back up to one bucket and share deduplicated data with no server between them
- Chunks are stored individually, so any storage with basic file operations works as a backend
- Client-side encryption before anything leaves the machine
- Supports a long list of cloud providers plus SFTP and local disks
Limitations
- Licence is not open source; commercial use and the web interface are paid
- The free part is a command-line tool, so the friendly front end is the paid one
- Restores are slower than tools that pack chunks into larger files
- Documentation assumes you are comfortable in a terminal
Details
- Pricing
- FreemiumThe command-line version is free for personal use and its source is published. The Duplicacy Web GUI and commercial use require a paid licence.
- License
- Proprietary
- Developer
- Acrosync
- Platforms
- Windows, macOS, Linux
- How it runs
- Downloadable app
- Account
- Not required
- Works offline
- Yes
- Best suited for
- Backing up several computers to one cloud bucket with deduplication across all of them
- Categories
- Backup tools
- Last verified
- Added
- Provenance
- Selected from the TechWalrus downloads catalog (Backup); facts checked against the developer's own pages, 3 sources on file.
Alternatives to Duplicacy
Compare allSoftware that can replace Duplicacy for an important use case, and what changes if you switch.
restic
A single-executable backup program that makes encrypted, deduplicated snapshots and can send them almost anywhere.
restic is open source under BSD-2-Clause with encrypted deduplicated snapshots to many backends, but it is command line only and lacks Duplicacy's lock-free sharing design.
Kopia
An encrypted snapshot backup tool with both a command line and a proper desktop app, pointed at whatever storage you choose.
Kopia is free and open source under Apache-2.0, including its desktop app, and offers encryption, compression and deduplication, though it is still pre-1.0.
Duplicati
A backup client with a web interface that encrypts your files and pushes them to more than twenty cloud services.
Duplicati gives a free MIT-licensed web interface and scheduler with encryption to many cloud services, but restores of very large backup sets can be slow.
BorgBackup
A deduplicating archiver for Linux, macOS and BSD that makes daily backups cost almost nothing beyond the day’s changes.
BorgBackup is open source with strong deduplication and encryption over SSH, but it has no native Windows build and is command line only.
Arq
Encrypted backup software for Mac and Windows that stores backups in your own cloud account or disk.
Arq is paid, closed-source software for Mac and Windows with end-to-end encryption to your own cloud, and it drops Linux support.
rustic
Create encrypted, deduplicated backups in restic-compatible repositories.
rustic writes encrypted deduplicated backups in restic-compatible repositories under an open-source license, though it is younger and compatibility should be checked.
MSP360 Backup Free
Free backup software for personal computers that sends files to local drives, network shares or cloud storage.
MSP360 Backup Free sends backups to S3-compatible clouds, local disks and shares on all three desktop platforms, but it is limited to personal use.
Duplicacy as an alternative
Listings that name Duplicacy as an alternative.
Duplicity
Encrypted, bandwidth-efficient incremental backup to remote storage.
Duplicacy adds cross-machine deduplication in one cloud bucket and Windows support, but its licence is not open source and the web interface is paid.
Similar software
Related functionality, not necessarily a direct replacement.
Backrest
Schedule and restore restic backups through a browser interface.
Restic REST Server
Provide a remote REST storage endpoint for restic backups.
BorgBase
A hosted storage service for BorgBackup and Restic repositories with monitoring and append-only mode.
Restic Browser
Browse and restore files from existing restic repositories.
