Free and open-source differential file synchronization software for Windows, macOS, and Linux. ByteSync securely compares and transfers only file differences — no VPN, no setup, just fast, encrypted, cross-platform sync and backup.

Duplicati is described as 'Securely store encrypted, incremental, compressed backups on local, cloud, and remote servers. Runs on multiple OSes and offers command line interface' and is a very popular Backup Client in the backup & sync category. There are more than 100 alternatives to Duplicati for a variety of platforms, including Windows, Linux, Mac, Android and BSD apps. The best Duplicati alternative is Rclone, which is both free and Open Source. Other great apps like Duplicati are rsync, Macrium Reflect, TimeShift and Restic.
Free and open-source differential file synchronization software for Windows, macOS, and Linux. ByteSync securely compares and transfers only file differences — no VPN, no setup, just fast, encrypted, cross-platform sync and backup.

Snapper is a tool for Linux file system snapshot management. Apart from the obvious creation and deletion of snapshots it can compare snapshots and revert differences between them. In simple terms, this allows root and non-root users to view older versions of files and revert...

Performs scheduled command-line backups of databases and files to various cloud storage platforms, supporting S3, GCS, Aliyun OSS, FTP, SCP, with options for tar archives, file splitting, standalone daemon mode, and management via Web UI or HTTP API.

rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago.
S4 = Simple Secure Storage Service. S4 is Least Authority's secure off-site backup system for individuals and businesses.


Arco is a desktop backup application that brings the power of Borg Backup to everyone through a clean, intuitive interface.

KLS Backup - Powerful backup and synchronization program with FTP, WebDAV and cloud support (Windows Azure, Amazon S3, Eucalyptus Walrus)




A graphical interface for the Rsync engine that will synchronise files between two computers either locally or over the internet. The beauty of Rsync is that it only transfers the exact part of a file that has changed (differential synchronisation), saving bandwidth and time.

ZBackup is a globally-deduplicating backup tool, based on the ideas found in rsync. Feed a large .tar into it, and it will store duplicate regions of it only once, then compress and optionally encrypt the result.
DotSpirit Backup allows to automatically back up your hard drive to DotSpirit's secured servers.

Provides flexible full, incremental, and mirror backup with scheduling, old backup purging, and support for various storage locations, including local, external, network, FTP/FTPS, and optical media on Windows, giving users comprehensive control over data protection and recovery.

Swiss Backup is like an online safe in which your entire machine, your files, folders and even your OS configuration is stored, enabling you to recover an identical copy of your machine.
