you can buy an external usb 2.0 hard drive kit that plugs all together and gives you a nice looking case. it plugs into your usb port and you can use it like a regular harddrive, but the cool part is if you go to your friend's house or somewhere that they want the files, you can unplug everything and go to whereever.

plus like if you have an emergency like your house is on fire or a hurricane is coming, you can make regular backups onto that hard drive then grab it when you need to go.

i agree with the previous statement about making your old one a slave, or you could just install the new one as a slave to save you time reinstalling windows xp.