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#11
As I said before. Windows imaging requires the system partition to be backed up. This probably means your recovery partition which is relatively large.
I use Windows imaging primarily along with Macrium. You may be best with Macrium.
If you want to make a 4th partition (D: ) then Windows Disk Management will require that this be an extended/logical partition. There is nothing wrong with this but if you want a primary partition you will need to use a third party tool like Partition Wizard.