If you are goggle user  then go to www.goggle.com/takeout/ and back up your blogger data . It's very easy just follow this URL and use your G-mail id and select your blogger to bake up your data . It's gives you the option to back up your goggle drive , goggle+ , buzz , voice and YouTube data .

                                  It's gives you a option for download your back up from goggle . . .
                                    you can easily get back your blog post to follow these option
                                    settings>others>import blog . .