I need a medium of some kind to store my backup drive images of a windows 2003 standard x64 server. I will be taking DriveImage XML images every Sunday. The medium must have a minimum capacity of 250gb.

I am wondering what is the best/most cost efficient option? My budet is around $500.

I have heard tape and usb external drives.

Can you provide specific models, costs, pros/cons of each technology and product?