After 450-550 weddings, I have plenty of stories! Technically, I have been very fortunate. I have had a shutter literally blow out in cameras, I have trashed numerous flashes and a few other incidents with gear. With appropriate back-up, can easily go through a day without missing a beat.

I have had some difficult cards. Knock on wood, I have never had a card I couldn't recover. Hard-drives are a different story!!! It is not a matter of if they will fail but when. Back-up, back-up, back-up. 3 different devices, 2 different mediums, 1 off site!