my iso file is too big to save on a cd or dvd

i have just backed up a game of mine and its an iso file on my computer now. I would like to save it to a cd or dvd so that is doesnt waste space on my hard drive but the size of the iso file is almost 5gb. It definatly doesnt fit on a cd but it's even tooo big for a dvd. I was just wondering is there a way to maybe split the iso file and save it to 2 dvd's.

if not how would you recomend backing up this iso file

 

Or you could burn it to a dual-layer dvd.

 

is there a way where i could back it up on 2 normal dvd's

 

you could .rar the iso's individually, but you would have to unpack it every time you want to run the program. No matter what you do, it's not going to be pop-in-and-play without a dual-layer disc.