Yes! While I am photographing your wedding my camera writes the images to two cards simultaneously. So every time I take a photograph there is two images created on two separate memory cards just in case one fails. I only use the highest quality memory cards which means they are designed to guard against failure, I have never had a memory card fail. As soon as I am home from your wedding I begin downloading your files to my computer. Once I have downloaded your files to my computer I also make a backup on a separate high quality hard drive. I will keep your files on my hard drives for a minimum of seven years in case anything happens to your set.