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You cannot (easily) backup an original Dreamcast disc. You cannot simply pop it into a CD reader to copy it. It requires that you interface your Dreamcast and your computer together by serial or broadband connection and run specialized software on the machines that dumps the data to your computer.
Once the data's on your computer, you're through with the easy (but time consuming) part. Now you have to extract the data from the files, hack the files, downsample any audio or video files as needed to squeeze the data onto a normal CD-R disc, rip out files if you need to and you find that they are optional (network play function, foreign speech files, etc).
Then you have to assemble the files onto a disc in such a way as to be recognized by the Dreamcast (either as a non-boot or bootable disc).
It's easier to just find images of the games you have, online. Download them and burn using the appropriate software (read the FAQs and Tutorials at http://www.dccopyworld.com ).
Another thing, don't buy into these retailers who sell "MOD-CHIPS" for the Dreamcast. The only thing the MOD-CHIP can do for the Dreamcast is allow you to play imports. Unmodified Dreamcast machines can play backups.
Lastly, check the sticker on the bottom of your Dreamcast. If the date on the bottom is OCTOBER 2000 or later, you may not be able to use the older backup images that were assembled using a short audio track at the beginning. This was Sega's attempt to prevent people from using backup images. If this is the case, there's different disc format that will get around it by making an .ISO file (or .BIN using appropriate software) from the disc that doesn't work, and then use BIN2BOOT to convert it to a .CDI file that is designed to work on even the newest Dreamcast machines.
One final warning: DO NOT ASK FOR ISO IMAGES ON THIS FORUM. Search the web and newsgroups. They're everywhere, but it takes a bit of looking to find them.
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