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#11
Is the used space on the source greater than the available space on the target?
If so, you can't restore the image to the smaller target.
There are some ways to reduce the used space on the source before imaging. Cleaning out junk, deleting stuff you don't want is one method.
Another way is to exclude files/folders from the image that you don't need to transfer to the target. Only a few imaging programs can exclude files/folders from images and/or "clones".
O&O diskimage has that function, so does partition guru.