Here is some information:
Blog posts can only be exported individually. Blogs cannot be exported at the space level.
In 5.4, the Space Tools Export options clearly says you can export all pages and blog posts. However, when I tried it, only the XML export option include the blog posts, PDF and HTML options doesn't include the blog posts. At least in our environment.
( ) Normal Export
Generates a PDF file of all pages and blog posts in this space, including comments and attachments.
( ) Custom Export
Generates a PDF file of selected pages based on options that you choose from below.
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