I have four 6 day park hoppers that I bought for our trip to WDW in 2003. We used three days and one option. We should have three more days and 2 or 3 options left. How do I know the cards have the correct number of days on them? What happens if the cards get de-magnatized. Does Disney keep backup information for the cards in a computer somewhere based on the card number? I am sure this has been covered in the DIS boards in the past, but am having trouble pin pointing the information. Thanks for your input!!!