If I understand correctly you have tried making a backup of a backup that you are not sure is working properly. Why don't you try making a new backup with your best media right from your original? 
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Xbox v1.1 120Gb w/Xenium
NTSC V7 PS2 somewhere in Limbo
Windows XP, 1.67GHz Athlon, 768 MB
JLMS DVD-ROM LTD-166S
HP DVD Writer 200i
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