Your media is the weakest link in any workflow. I see people on Facebook desperately looking for help with recovering footage from their memory cards or hard drives. Reading the comments, it's almost always the same story - They bought them from Amazon. If you're buying your memory cards or hard drives from anywhere other than a camera store, you're risking a lot.
Being proactive with protecting your memory cards goes a long way. Especially when I was working weddings, I saw so many photographers pull a full memory card out of their camera and put it in their pant pockets or drop it in a camera bag. 😬 Keeping your memory cards safe and organized is the first step in making sure you don't lose your footage.
Use the 3-2-1 strategy, which involves having at least three copies of your data. Two copies are your backups which are an exact copy of your original footage, and one is your editing drive. Ideally, you should keep an additional copy off-site to prevent loss in case of a disaster.