I don’t think you can export scheduled posts – as they will be scheduled for the blog in which they were originally posted, but you can certainly export and then import into another blog, draft posts. I have done that many times.
A suggestion: before the scheduling makes them go live, go into the ‘All posts’ area and edit them so that they are all published private posts. Then export them like that. You can then make them draft again later, once they’re in another blog.