I didn't back up with unique numbers. I was hoping there would be some sort of restore or backup built in, but from your response I'm guessing no?
I'm using a different version as when I started. After working on the project for some time, I ran into an issue where all the audio files were stuck on "processing" indefinitely. I looked up what to do and saw that I should clear that cache, that didn't work, so I kept looking and saw I should update to the most recent version of VP. That didn't work either, but then I tried clearing the cache again, then restarting, and then the audio files processed fine.
However, it was only a couple days later that the audio suddenly went missing completely. Are you suggesting the update might have somehow been the issue?