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.
The Solution:
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.
1- Start>Run>diskmgmt.msc
2- Right click on the System Reserved volume ( or partition ) and give it a letter.
3- Start>Run>cmd
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.