Of course, you can not restore an image to a running system from software that is running on that system, it will simply crash!
The bootable media usually uses either a Linux variant, or a proprietary operating system to boot the machine and carry out the various operations required like mounting discs etc etc.
The image is NOT on the recovery media! The image is on some other source, in my case usually an external USB disc.
Regards.....
Mike Connor
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