you clearly didn't travel enough, card failure is the least of problems you could find during a long trip. You could get stolen, you could lose one of your cards forgotten in one pocket that you sent for laundry, one of your mates could push you into a pool while you have your phone in your pocket, and the list goes on. All these (and more) happened to me during trips and what brought peace of mind was to send my backups home during my trips, its a good and cheap way of making sure that whatever happen to you and your gear, your photos are already safe.