GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Carbon Copy Cloner - Carbon Copy Cloner (CCC) features an interface designed to make the cloning and backup procedure...
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.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Time Machine - Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.