Your blog is almost a living, breathing thing. It's your presence on the web. The posts in your blog are equivalent to the flesh - they give the blog content, features, and personality. The template is equivalent to the skeleton - they give your blog structure. The template isn't visible, like the posts are - but it's equally as important. Change the template, and you change the way all of the posts are displayed. Hopefully, you back up the entire blog, maybe by mirroring it , periodically. That's a very good idea. You don't want to have to involve Blogger Support, except in extreme situations - like when your blog gets deleted . (Note): These instructions are specifically written for Classic blogs. They will work for Layouts blogs also - but for Layouts blogs, Blogger provides a GUI template backup for backing up and restoring the template. It's also a good idea to back up the template. If you make changes to the template, back it up before and ...