If you need backup, look to a new hard drive. Staples Canada is having a Hard Drive blowout sale on many of the popular brands you know. Shop Seagate, HP, Western Digital, Verbatim and Clickfree hard drives from 250 GB to 2 TB.
If you want the most space for under $100 check out this Western Digital 1TB My Book Essential External Hard Drive for only $79.97.
My personal favourite and what I would buy if I was looking for a new hard drive is the Verbatim 750GB Acclaim USB Portable Hard Drive in redor blue. Both originally $119.95 each now $79.97 (I know cause the black one isn't on sale!) You are saving around $40!