Well if you Have the Games then Yes you can just Download them as you'll just have the Backup of the Games
As for riping them you need to buy a game that has a PC cable on it and a slot for place a game on it
i can't remeber what it was called =/
Here is One of the frist ways they did it witch will Take a long time and kind of hard =)
http://www.tripoint.org/kevtris/Projects/copynes/