Dedoimedo published a review and tutorial on RescueZilla.

RescueZilla - Fast, efficient, reliable - perfect imaging tool

Review and tutorial of RescueZilla, a free, open-source, live-media system imaging and disk management toolbox based on CloneZilla, covering backup and restore of Windows 10 with two hard disks, image compression and verification, restore with or without partition table overwrite, some extras, other observations, and more.

RescueZilla - Fast, efficient, reliable - perfect imaging tool