backup ps2 newbie

[jmaverick101]

i just bought my ps2 about a week ago and im trying to buy a mod chip for it. how can you tell which type it is. also i was thinking of buying the ps2 neokey sbox modchip. it looks like all you do is connect it through the usb port. anybody tell me what problems i might encounter with this. 1 more thing, what programs can i use to create ps2 images, and should i buy dvd'rs or cd'rs to burn them too. how big are the average games. thanks for any help. im new to the ps2, but ive backed up my pc games and my dvd's with my dvd burner so im not that much of a newbie