Haven't seen a guide, how do I back up DC games?

[Dabura_HG]

This has probably been asked before, or maybe not, but since I've looked for a guide and haven't found one, I'd like to ask how to properly back up DC games.

I've tried it before, but when I insert a DC game into my CD-Rom drive, it shows a couple of Read-me files and that's about it. When I tried to make a 1:1 copy in Alcohol 120%, the whole CD was about 3 MB. I must be doing something wrong.

Also, it seems that sounds and music must be down-sampled (is this the right word?) in order to get them to fit on to a 700MB CD. Any info on this is also appreciated.

Any help/comments are welcome.

Thanks a lot.