tumbleweed books

I've been working in Legacy [its just a much better interface for managing my data] and want to move my databases to an external drive. 1) how can I do this? I've seen older comments indicating it was possible on prior versions (before Evernote v10) and 2) can Legacy continue to update to that location after I set it up? Also 3) dangers of 'corrupting' my data? Thanks,