The Content Club links should stay in your account forever. There have been some problems in the past with a few of the links. The coupons that are redeemable with 3rd party vendors should be redeemed during the time they are provided. For example, the Groove3 video coupon needed to be redeemed in January/February. If you have the AAS coupon, you should redeem it now.
I always download everything from my account when it becomes available and make backup copies, just in case. I also periodically take snapshots of the registrations page as part of my backup strategy.