ncdu - A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
Baobab Disk Usage Analyzer - Baobab Disk Usage Analyzer is one of the light-weight disk analyzers that offers you a chance to view and monitor the disk usage & folder structure without any hassle.
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
K4DirStat - K4DirStat is the successor of former KDirStat.
AOMEI Backupper - AOMEI Backupper is a software created to help a person backup, restore, clone, and sync their entire Windows system.