Backing up your blog is crucial thing you should be aware and this tutorial help you can backup all data blogger/blogspot.
Using Google Takeout for Backing up BlogSpot
1. Go to
Google Takeout page and if you didn't sign in to your account, so you have to log into your Google account to view that page.
2. Now select Blogger data you want backup. It will be taking some time if your Google account has more blogs and they have more content. Google will inform you by email once everything is done. So don’t fuss if the archiving function doesn't work quickly.
3. After compressing the files, you will be informed that now you can download your BlogSpot blogs and images you uploaded to Picasa. Click on the ‘Download’ button and wait until files are downloaded.
Done! Enjoy!