code: def get_state_paths(cls, impl, working_dir):
          
          return super(BlockstackDB, cls).get_state_paths(impl, working_dir) + [
                  os.path.join(working_dir, 'atlas.db'), 
                  os.path.join(working_dir, 'subdomains.db'),
                  os.path.join(working_dir, 'subdomains.db.queue')
              ]
docs: Get the paths to the relevant db files to back up