Not only is this a good practice from an animal-health perspective, but it also assures that if you had to evacuate, you are not left scrambling to find proof of vaccination. You may want to keep a binder with waterproof page protectors where you can store their vaccine records, a color photograph for identification purposes, microchip information, and other important records that you may want to have with you in case you needed to evacuate your home or if your animal became lost in the aftermath of a disaster.
Even if you do not regularly use crates for your pets, it is a good idea to own an appropriately-sized crate for each animal in your household and to help your animals acclimate to using them. If you do have to evacuate and crate your animals, you want them to be comfortable spending time in their crates and not stressed by the novelty of being crated.