Ok… let me see if I can make this a little clearer.
Blogger has two options, hosting the blog on their server (example: https://www.myblog.blogspot.com), or hosting the html files on your own domain/sever (example: https://www.myblog.com). I have chosen to use my own domain/sever.
Blogger holds the database, and when I publish, the html is written to my domain/server.
Since Blogger.com is now blocked in China, I can get to my html posts on my own domain/sever, but I can’t get to the database.
I can’t “export via my host’s backend”.
