The camera shops at all 4 WDW theme parks will download your pics from memory card to CD for $12.99 per CD, limit 120 pics per CD. Many times it can be done while you wait, but if they get busy you might have to leave your memory card and come back in an hour or two.
The camera shops in MK and MGM, and the Kodak ImageWorks shop in Epcot, all have self-service download machines. Cost is still $12.99 per CD, but I don't know if they limit the number of pics on each CD.
If you have a car, all of the local Walgreens stores have 24-hour photo labs that will download your pics for $3.99 per CD, for as many pics as the CD will hold, usually while you wait.
IMHO, Robo is absolutely right about the "eggs in one basket" theory; no matter how you back up your pics, you should split your pics up somehow in case of disaster so that you won't lose all pics from a single incedent.