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.
Rclone ("rsync for cloud storage") is a command-line program to sync files and directories to and from different cloud storage providers.
rsync is a software application for Unix which synchronizes files and directories from one location to another while minimizing data transfer using delta encoding when appropriate. An important feature of rsync not found in most similar programs/protocols is that the mirroring...
TimeShift for Linux is an application that provides functionality similar to the System Restore feature in Windows and Time Machine tool in Mac OS. TimeShift protects your system by taking incremental snapshots of file system at regular intervals.
restic is a program that does backups right. The design goals are: Easy, Fast, Verifiable, Secure, Efficient, Free.
I like Restic because of it's speed and simplicty in installation and operation.
Almost everyone thinks Restic is a great Duplicati alternative.
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.
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.
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.
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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.