The Import & Export feature in Blogger is now live and can be accessed from the Settings tab(Basic) of your Blogger dashboard.
Import blog - Export blog - Delete blog
With "Export Blog," you can easily create a complete backup of your Blogger blog on to the hard drive and this may come handy in situations when you accidentally delete some old blog post or if Google blocks your blog due to policy violations – at least you’ll have a local copy of all the content that you may publish elsewhere.
Other that creating a safe backup, you may also use the export (followed by import) function to merge multiple blogs into one.
For some more detailed info on all of the things you can do with Import and Export, please check out Official Google accompanying help article.
See a Live Example Of My blog on 19-sept
NOte:make sure to backup your widgets in sidebar as it is not possible to back up that