I regularly print out reports to keep all that info just in case something happens. I also periodically back everything up onto hard disk. Feed cards are easily printed out for customers that shows all the info, along with a picture of the snake.
But this is just what is working best for me. I've got over 50 snakes and am horrible at losing things so it'd be just a matter of time before I lost paper feed cards. LOL
Degei is great and the basic version is totally free. I urge anyone to give it a try, even if they only have one snake. It's so easy to see trends at a glance.