Backing Up/Updating My iPod Touch 3rd Generation

Hi everyone!! So I'm updating my iPod Touch so it has the same capability, besides the camera, as the iPod Touch 4g :D Backing up my iPod is going to take about 7-9 hours n everytime I leave my computer, if it goes to the black screen, it says "There was an error backing up your iPod" n I have to start over again! It's happened TWICE :( This time I'm not leaving my computer 'till it's done! :) This is just until I save up enough money to get the iPod Touch 4g which is hard to do since I don't get an allowance but I'll figure something out :) Well I'll talk to you all later!!