Synchromat - Synchromat is file and folder synchronization software for Windows.
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
MirrorFolder - MirrorFolder is a real-time folder synchronization and backup software
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
CopyQueue - CopyQueue - Copying under control.
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.