WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
TreeSize - TreeSize tells you where precious disk space has gone to.
Easeus Disk Copy - EaseUS is a suite of data recovery and protection software designed to bring back files that have been lost, destroyed or accidentally deleted and protect existing files from suffering the same fate.
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
HDclone - HDClone by Miray Software is the universal tool for cloning disks and other mass storage media fast and easily. To be used for backups, data recovery, system migration and professional duplication of several disks at a time.