I do not understand the madness of your logic. You state that you have two internal drives you want to stripe together and yet you with to backup to DVD? It makes no sense. The G4 iMac came with only one internal drive and on top of that, it is a PowerPC CPU. The last G4 to enter the market was July 2004. Thats more that 7 years ago!
Should you be actually using this because of some special software which I am at a loss at what it could be, Use DropBox to store whatever you might use, which really cannot be much. These days of 1T drives, using a DVD for backup is simply not practical. By the time you calculate out the partitions and how many dozens of disks, not to mention the labelling. It would not be a practical way of backing up. Just to throw you out an example for 1T of data; min 20 DVD's @ 10 min to burn. That is a minimum 3 hour task that you would have to be on top of for the whole time.
Best thing you could do is retire the G4 and/or go back to your old configuration... by the way, there was no option to put another drive in a G4 unless you got rid of the DVD. I am not going to touch on how you installed your OSX on a Raid setup.
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Danarchy commented: Rude at the end and posting to Dani herself no less. -1