Is there a way to export Orion maps?
Not in the way you think. You could (in theory) grab the JSON that makes up the definition, but what good would it accomplish?
The JSON is built around the individual entity ID's (think of URIs) for that particular system. If you were to export it, you'd have to go through and manually edit every single Asset and Edge in the JSON to make it work on another system.
Simmilar to what Kevin said, there's some stuff in the containers table for maps, but it'd be hard to work with