Have back-ups for everything.
When dealing with important data files, make sure it’s saved in more than one place; for instance, save a copy to your laptop or desktop if you normally keep it on just a flash drive. You never know when you might lose the flash drive or it stops working for whatever reason. As for plans, it should be obvious, but always have back-up plans in case an event, idea or initiative you are working on doesn’t work out how you had wanted.