# File lib/fog/rackspace/models/block_storage/snapshot.rb, line 66
        def save
          requires :volume_id
          raise IdentifierTaken.new('Resaving may cause a duplicate snapshot to be created') if persisted?
          data = service.create_snapshot(volume_id, {
            :display_name => display_name,
            :display_description => display_description,
            :force => force
          })
          merge_attributes(data.body['snapshot'])
          true
        end