Take a tip from the pros and keep duplicate copies of your important photos and videos. Even better than keeping duplicates is housing one set of files in a different location.This is a smart idea to do for your printed photographs as well.
How does JB Photography do it? My computer has a master and slave drive so when files are saved to my pictures library they are duplicated to the other drive. I also burn them to blue ray disks a few times a year and have them in a fire proof safe. Lastly a backup portable devices rounds it off.
It has saved me in the past. Most recently my drive failed, but had everything safe and sound!