Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
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.
AOMEI Backupper - AOMEI Backupper is a software created to help a person backup, restore, clone, and sync their entire Windows system.
DriveImage XML - DriveImage XML is an easy to use backup and restore program for Windows XP and Vista. Part of Runtime's Data Recovery Software products.