Sorry, somehow missed this thread until today:embrass:
I use to take alot of wedding actual day during the film days With my main being F5, 28-70 and 20-35 with hammer flash, seldom take them now as i prefer to spend more time with my family. I do however still take wedding shots for friends, i will use D700 with 24-70 for both day n dinner and a tokina 20-35 as back up for tight areas. If an outdoor shoot is pre requested, i will bring along 85 f1.4 and 70-200. Flash will be a SB600.
I am one of those photographer that will not ask the couple to look at me or pre arrange anything for taking pictures as couple had already done that during pre wedding, what they need is natural during wedding day.
I always carry a back up, S5 with 12-24 and 18-200 with SB-26 (i know very old flash) just in case anything goes wrong with the main set.
For my style, i change memory cards very often like after every event and keep them in a very safe area. This is to prevent memory card damage and all photos destroyed. By changing very often, what i lose will only be part of the wedding and not most of it. That is a non repeatable event and i play 'kiasu'
I had been asked as a back up photographer many times, but please make it clear to the couple and all family members that they are suppose to look at the main camera man, just pretend that i m not around unless i told them to do so. Just imagine, the couple look at different photographers....
OT a bit, when i go holiday, i will make sure i have enough CF cards (7 for 7 days trip, 8 for 8 days trip) and so on.... with one additional spare. I change CF card every end of the day, this is to prevent damage card, loss card or loss/stolen camera. At least what i lost is only limited to a day's photo and not all of them, after all, photography and holiday is all about memories
cheers!