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#11
OK. I see from disk management that it's formatted as ntfs.
Now there is no way a system image of C and only C to M can fail unless you have a corrupted system or you have references to M on the C.
To test, you can shrink M in half-its empty anyway-create a new partition in the empty space and name it N or whatever. Now try the "create a system image" specifying C and C only as "source" and the new drive, N, as where to put the backup.