Not really. That's what every Photoshop user learns as the SAVE AS lesson. LOL Once you've done something, save it as soemthing else so you don't lose the clean version.
Ahh this is so true, I have learned that you can never have to many layers when it comes to making graphics, shadows, highlights everything on it's own layer and I tend to save serveral versions of the graphic as I go. I can have one grpahic saved with 10 different names just in case I want to redo for another look without going through all the layers.