Ghost 15 Creates two types of system images

I am running Win 7 64 bit with Ghost 15.  I recently had to reload Ghost and the backup jobs I created are now a bit different.  I definately did something during the job setup.  I am sure there is nothing wrong here but I don't understand why it appears to be creating two separate System image files when the backups run.  One that I am very familiar with which is a copy of the entire C drive which is a pretty big file.  It calls that DonsPC_C_Drive 001.  It does the incrememtals and new recovery point weekly like it always has.  But what is new is it ALSO creates a very small file called DonsPC_System0-1_Drive 001 along with incrementals for it as well.  What are these files?  Do I need them?  Why are they NOW being created?  If I had to recover my computer and it asked for the restore point what one would I use?  Logic says the DonsPC_C but would it also use what appears to be the second file that is associated with it?