Cant make backup of my own Games ! *Plz HELP*

[Ulrik]

I cant make a backup of "Metal Gear Solid 2 Substance" becous the original DvD is on 6,41 gb.
So i copyed all the files to the computer Hd.
And the names of the files is:

default.xbe
disc1_0.dat
To
disc1_8.dat

And:

disc2_0.dat
To
disc2_8.dat

And they were all on 1 DvD, but my DvD-R can only take 4,5 Gb.
Can i split it on 2 DvDs ?
Or can i remove some of the files ?
Any ide how to make it work ?

Plz help me out here