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.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic