Hi,
• You can only do a system image recovery to HDDs/SDDs that are the same size or larger than the one(s) included in the system image when it was created. You will not be able to do a system image recovery to a smaller HDD/SSD. If the HDDs/SDDs are larger, then you will have "unallocated" space afterwards that is left over from the difference that you can extend into.
• When you restore your computer from a system image, it is a complete restoration. You can't choose individual items to restore, and all of your current programs, system settings, and files are replaced with those on the system image.
• If your system image is on an external or removable device (ex: USB drive), then make sure it is connected before starting. If it's a USB device, then make sure that you also have your BIOS settings (ex: Legacy USB) set to allow USB devices to be recognized at boot.
Thanks.