One thing to keep in mind is that in the event of a true emergency cancellation, ie within 30 days of a scheduled trip, no use year will save your points. They will go into a status called "holding" which severely restricts how they may be used (can only reserve at 60 days or less) and they won't be eligible for banking regardless of when in the use year the reservation was cancelled. It is true that the more time left in your use year to use the holding points the better your chances will be, but resort availability at 60 days isn't great at many times of the year.