mkisofs will create a valid iso to burn to the cd. If your just burning tar files to the cd your could probably skip it.
I'd personally wouldn't write the script to pipe from tar directly to cd unless I was absolutely sure the files were going to be less that 700M.
I backed up to tape or DVD.
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"The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words." -Philip K. Dick
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