1 DVD9 to 2DVD5?

[evewasdyn]

Most movies are under 2 hours. So no lost quality in the back-up. Even 2 1/2 hours is doable.
But some are are up to 3 hours long, on just 1 DVD9 disc. Saving Private Ryan was 2 hours 50 minutes. And a DVD2ONE back-up looked like a VCD in some places.
Fellowship of the Ring...3 1/2. But upon buying the Extended Edition of it. It came in 2 DVDs, 2 hours long. Back-up possable. Joy.
I already ordered the new Two Towers. And wish to back it up, before they get home in a few weeks. So they can keep the copy in thier room.

Is there any way to "split" a movie into 2 discs? To save quality.