The best open source alternative to SyncToy is FreeFileSync. If that doesn't suit you, our users have ranked more than 50 alternatives to SyncToy and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SyncToy are rsync, Unison File Synchronizer, Synkron and Bacula.
Open-source software for syncing and backing up files across Windows, macOS, and Linux by transferring only essential data.
Germany
EU
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.
United States
Unison is a file-synchronization tool for POSIX-compliant systems (e.g. *BSD and GNU/Linux), macOS and Windows, with the caveat that the platform must be supported by OCaml. It allows two replicas of a collection of files and directories to be stored on different hosts (or diffe.
United States
Synkron is an application for folder synchronisation and folder-backups that allows you to configure your synchronisations in detail. Despite having many features, the user interface of Synkron is very user-friendly and easy to use.
SlovakiaEU
Bacula is a set of computer programs that permit managing backup, recovery, and verification of computer data across a network of computers of different kinds.
Switzerland
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.
DirSync Pro is a small, but powerful utility for file and folder synchronization. Java JRE 1.7 or above is needed to run DirSync Pro.
NetherlandsEU
Application for backups. Backups are created using the echo principle. New and updated files are copied from the original folder to the backup. Renaming, moving and deleting files occurs only in the backup.
Russia
JFileSync is a Java application used to synchronize directories of two different file systems. For instance, you want to synchronize a set of directories on your laptop with a set of corresponding directories on your workstation. English and German UI.
GermanyEU
Norway
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.
France
