Just guessing when and where blogs should be exported or no.
Under Moodle, blogs are user-based and I really think we should respect that. So, what about this:
1) New setting "Backup Blogs"
2) If the site is being exported with users and the setting above is enabled, export blogs for those users (obviously, if no users are being exported or the setting above is off, no blogs will be exported).
Question A: This way, we'll make blogs independent from SITE and dependent from users being exported. How does hat sound?
Question B: And next step is restore... I really know how to restore blogs themselves... although I've some doubts about how to play with the setting existing in the destination server and how they affect to the settings being imported (or don't they affect? ). Any insight about combinations would be really great!
Question C: Also, what happens with blog tags? Should I import/export them together with each blog entry and rebuild them on destination?
Ciao 
Thanks, Eloy! $