My son-in-law has one final paper to finish before he gets his MA on December 14. He had just finished the next to the last project and was turning his attention to the paper when his computer crashed. With many of the articles he still needs to read for the paper on it. We are at the moment trying to get back into the computer and, hopefully, will be successful. If not, we will all start trying to duplicate his search and find the articles again.
But to the reminder -- to myself as much as to anyone else -- please back up your stuff! You never know when things will come crashing down around you!
I know I start out with good intentions and then get busy and forget. I know that's what happened with my son-in-law. Don't let it happen to you!