I know some Adobe products can create a folder to save the original while editing but it would depend in the software you were using to have this feature. Some create a temporary file and forget to delete it but that's not reliable. I guess the lesson is to do this yourself and copy the file to another folder to work on it. What I'll do is use "save as" and add some alpha/numeric character at the end of each filename. It's probably best that you take control of this yourself.
Basically, I had a video file which I tried to import into After Effects, but the file was obviously too large and resulted in After Effects crashing, as a result of this, my video file became corrupted. It will now no longer play properly (not allowing me to fast forward), and will stop after 1 minute of play (when the video was actually 10 minutes of length), it has also reduced the file size from 700mb to 100mb.