If you use Blogger, like myself and Dennis Cooper, to backup the blog, select Settings, scroll to bottom and select Other. There is then an Import & back up section with a Back up Content button. This will trigger a download of all your content in an XML format that you can upload elsewhere in a worst case scenario.
WordPress users can follow their own backup instructions.
Want to backup your email, too? The easiest way is to use Google Takeout, where you can download any and all of your Google data (including Blogger).
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