Have your designs backed up in several places - flash drives are great but have a higher failure rate so I would back them up to more than one. I have my on an external hard drive, on my computer, and on a 3 TB network hard drive. I am not good about backing up - in all likelihood I would probably loose a few designs but I would not have a devestating loss. I do try to back up to one of those locations once a month. If you do this awhile you will end up with a phenomenal amount of data. The other thing you can do is to subscribe to a data service like Carbonite.