I am relentless about protecting my clients' wedding day images and have multiple backups. If you are curious as to what I mean by that here is how it works:
My cameras have dual memory card slots, meaning that on your wedding day I am making a copy of every image I capture on two memory cards. When I leave your wedding I physically secure those memory cards. Before I go to bed I have downloaded the images from those memory cards onto two external hard drives and uploaded them into a photo management software and Lightroom. Additionally, I do not write over the memory cards from your wedding day until I have delivered your gallery to you.
If you count the total number of backups, I have five copies of every image from your wedding day. I promise you that I will protect your wedding photos as if they are my own.