Most dealers will tell you not to store your designs on flash drives as they can(and will) fail, just like hard drives do. A flash drive is only meant to be a temporary bridge between your computer and your machine. I copy a design from the computer to the flash drive, I never move the original designs to the flash drive. I keep my designs in files on my computer but also have back ups just in case. I also keep the emails from when I buy designs that have the zip files in them. That way if I lose something I can go back and open the original from the email if I have to.
Cari