I understand where you are coming from.
There are some major shortcomings with Windows System Image.
The GUI forces you to image the system and boot partitions - you can add other partitions if you like - BUT you will have to restore them all. You might only want to restore one.
It adds the extra/incremental images to the same folder - you can't put them somewhere else if you are short of space.
If you move the image , or change the drive/partition arrangement, it might not recognize them - and you won't be able to restore.
There are free
3rd party programs which allow you to choose which partition(s) to image, where to store the images, which to restore, and where to restore them to. They also allow you to browse to locate an image - so if something is different about the drive arrangement, or the name has been changed - you can still pick it up and restore it.
In addition, they are faster and offer better compression. Paragon Backup & Recovery 10 Free Edition Macrium Reflect FREE Edition - Information and download
Hope it helps.