Don't lose sleep worrying about your hard work. Have a back-up plan and back-up regularly.
We highly recommend that you make back-ups of all the ASSET files on your own PC AND a cloud service (you never know when you might get PC problems).
If you are working in a team, make sure your cloud is accessible to all of your team members who would require access to it so that they can back up as well as access any new versions of them.
Some examples of cloud services are Google Drive, DropBox, Microsoft OneDrive, Apple iCloud and Carbonite.