Always save a backup of WordPress Theme
I’m sure I don’t need to tell anyone, who has been tweaking themes in WordPress, the importance of saving the theme you are working with. Saving it on your desk top, save it in a separate folder, but do save it. WordPress always suggests backing up your data, and perhaps that is important as well, but if you don’t have a recent copy of your design, before you start mucking with it, you will be sorry by the end of the day.
I have relearned this lesson several times, most recently on a WooTheme that I was mucking with. I did something that made it render wrong in Safari and Chrome, but not FireFox, and because I was testing in FireFox, I didn’t notice right away. The client brought it up, and I didn’t notice or understand what he was talking about until he mentioned which browser he was in. Fortunately, I had kept a copy of my earlier Theme, so I just reloaded it, and then copied my custom.css over again It was so much easier than having to back track where I had gone wrong with the theme.