No, files are not backed up. I deleted them from Sony Vegas. I was transferring files from one project to another because I wanted to keep the setting of the first project for the second project. So I did a SAVE AS from project 1 to project 2. So of course, the WAV files from project 1 were still there. So I decided to delete the wav files from that project to make a clean start and import files from project 3 onto there (project 2). My bad.
Anyway, I fully accept that it’s all gone. I just have to repeat everything. Sigh.
But thanks for the conversation and the tips.