This issue occurs after you perform a RESTORE of a System Image Backup. I just know that every time you perform a Restore of a System Image, some data will be written inside the System Reserved volume . This data, will not be deleted after the restore.
You have to “clean” the system reserved data …in the USN Journal. Follow the steps bellow to clean this reserved area, you can then perform another image backup.
2- Right click on the System Reserved volume ( or partition ) and give it a letter.
4- Fsutil usn queryjournal Z:
5- fsutil usn deletejournal /N /D Z:
6- Create the System Image Backup again
7- Repeat the steps 1 and 2 and REMOVE the letter from the System Reserved.
This will give you 30~40Mb of space inside the System Reserved partition, you can now use the System Image Backup.