Burn CD's with the command line:
1. Put the data you want to save in a single directory, which I'll call /home/user/whatever and then make your image file, which I'll call "my_image.img" by running this command:
mkisofs -r -o my_image.img /home/user/whatever
2. Burn it to CD by running this command:
cdrecord -v speed=8 dev=0,0,0 -data my_image.img
Adjust the speed parameter to match your CD's specs and you're set. -- J.W.