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OS and Boot sector and possibly the System Reserved volume while all that is automatically covered in a full one shot system image backup of an entire drive. Need to see Windows restored with everything still intact the system image option. Cloning is the older method used mainly by corporations before imaging softwares were developed and first seen on the consumer market.
The advantage of imaging over cloning is being able to restore the backup image made to the source drive at a later date while cloning to the source from a clone won't work is the source drive ends up with a bad day for some reason! Cloning once finished sees the destination drive made immediately available while the image created then has to be restored to the source or other drive but can be restored endless numbers of times as long as the image stays intact without seeing any eventual corruption or comes out intact from the start.
As for documentation every company will see it's own library of topics related to the type of products being sold. Acronis has their page with embedded videos outlining how each of the two options is done with their latest software of course. Difference between Backup and Disk Clone | Knowledge Base