GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.