Mike
Contributor
Best thing to do is always have 2 versions of your raw video files. One on your SD cards and another saved on your laptop. If you leave it all on one SD card till the end of your vacation you run the risk of catastrophic loss. if the SD card fails or gets stolen. Shoot with a small SD card and transfer it every few dives to your laptop and you risk loss if the laptop gets stolen, or damaged. Shooting on multiple smaller SD cards and transfering files after dives while keeping same files on your SD cards ensures two copies. Emailing copies of files to yourself is another option.