Duplicate your images in stages and save them. It's useful to organize your computer like so:Set a general folder for all your editing jobs >Beneath it, make new folders for the different sites / jobs you make them for >beneath it, make a new folder for each entry you makebeneath that, make 2 folders: 1 for the final product and 1 for the stages.Inside that stages folder your images should be saved like so:#######-1a.psd#######-1b.psd#######-1c.psd.......#######-2a.psdand so on. Obviously the idea here is to save your work in case of a computer crash - but also so that you can go back to another starting point easily should you mess up badly somehow. (And of course, it's much easier to write tutorials when you have stages to get back to ;)Like I said - this was quick and dirty, but take these ideas to heart and you'll see just how much more efficient your photoshopping will become.