CMIS Visitor pattern for copying folder structure multithreaded?

I would like to copy a specific folder structure from one instance of Alfresco to another.

This folder structures includes huge amount of data which should moved, but only this one which are not older than 30 days.

I thought to implement a visitor pattern based java tool which iterates through the folder structure. If the node was visited I would lock the node and go forward, if it wasn't visited I would copy the node to the other instance.

Is this a good Idea or do somebody have other ideas, or experiance with that?

Regards Kaffi