The best open source alternative to Duplicati is Rclone. If that doesn't suit you, our users have ranked more than 100 alternatives to Duplicati and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Duplicati are rsync, TimeShift, Restic and Kopia.
Versatile command-line utility for syncing, copying, and verifying files across local disks and multiple cloud storage providers. Features include hash-based integrity checks, timestamp preservation, compression, encryption, and mounting storage as drives for backup and transfer tasks.
Utility for Unix file and directory synchronization using delta encoding for efficient transfer, supports compression, incremental backup, remote operation via SSH, customizable filters, permission and timestamp preservation, and daemon mode on TCP 873.
Enables regular incremental snapshots of Linux systems, preserving system files and settings. Snapshots can be restored for system recovery, use minimal disk space, exclude user files, and are managed with a user-friendly interface for reliable protection.
restic is a program that does backups right. The design goals are: Easy, Fast, Verifiable, Secure, Efficient, Free.
Kopia is a fast and secure open-source backup/restore tool that manages filesystem snapshots in a remote storage. It features client-side encryption, compression, backup policies. command-line interface and more.
BorgBackup (short: Borg) is a deduplicating backup program. Optionally, it supports compression and authenticated encryption.
Déjà Dup is a simple backup tool. It hides the complexity of doing backups the Right Way (encrypted, off-site, and regularly) and uses Restic behind the scenes.
UrBackup is a open source client/server backup system, that through a combination of image and file backups accomplishes both data safety and a fast restoration time.
Duplicacy is a new generation local and cloud backup tool that supports cross-computer deduplication. It is free for personal use and source code is available to commercial users.
Pika Backup is designed to save your personal data and does not support complete system recovery. Pika Backup is powered by the well-tested BorgBackup software.
Toucan is a small portableapp utility allowing you to synchronise, backup and secure your data with more options than the built in suite utilities. It is split up into 7 tabs, allowing you to easily find the function that you want.
Vorta is a backup client for macOS and Linux desktops. It integrates the mighty Borg Backup with your favorite desktop environment to protect your data from disk failure, ransomware and theft.
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Timeshift is a system-backup tool. Consider it only an alternative if that's what you are using Duplicati for, but if you are backing up documents or photos there are better alternatives.