If you switched recently before you saved a copy of your template, you could Google your blog name, then select "Cached." BTW, this is a good trick to use if you messed up your sidebar and didn't back it up recently, an old copy of your blog is still available via Google (that's what "cached" means). This happened to me recently, I had made some additions to my sidebar a couple weeks previously and I went to replace a comment in my sidebar, not knowing that my stupid touchpad had selected everything below the comment and I deleted everything and then saved my template without verifying that it was ok. I was able to get the code back by googling my blog, then selecting "Cached" and then right click on mouse and select "View Page Source" from the menu. Then I just copied the sidebar material that was missing.