|So to clarify then, you are using the DOS mode of Ghost 2003 to backup to an external hard drive and you end up with 15/2GB files?|
If you were to use the Windows version of Ghost 2003 you would end up with one file for each partition or the entire drive, depending on what options you selected.
If you feel that the system you are using is good for you then I guess you should continue.
As I mentioned earlier you could write directly to DVDR if you had that capability.
If you elect to continue as you are you might want to look into Acronis true image 2009. That program has the ability to perform an incremental backup. That would backup ONLY the differences from the last full backup.
You can find it at the link below. If you want you can download a FULL trial version directly from acronis. They charge more for their products than the resellers do so I recommend buying it elsewhere.
There appears to be slight differences in the listed products. Review before buying.