We are two photographers and always travel well in advance of the required start time. If one or both of us is ill or unable to attend for whatever reason we will arrange, where possible, for one of our partner associates to step in at our expense. We carry back up; cameras, flash guns, battery packs, lenses and memory cards. Your pictures are backed up in 2 formats on several individual memory cards, on separate computers and hard drives so that in the event of a hard drive or card corrupting, your photos are safe.