To dump your UMDs to your memory card or PC:
YOu need UMDdaxdumper 0.2 BETA. (THE BEST) in my opinion.
If you want to play PSX just backup any of your PSx games into "ISOs" then convert them into "eboots" as easy as that
When you do you'll get a .bin file and the eboot, create a folder whatever name you want, and add it to your "Game150" or "GAME" folder depending on your kernel settings.