How to put a copy of the Primary Business Object in server folder?

Hi,

Does anyone have a recommendation on the best way to put a copy of the PBO from a workflow into a local folder on the server?  We have Excel files that are being saved and routed in PDMLink (10.0), and at a certain point in the approval process we want to do some outside processing with the file.  Basically, the file would be placed into a folder on an FTP server, and then an ERP system would be updated with the location of the file.  This is all easy to do, except I don't know the best way to get a copy of the file into a local folder on the server.

If someone could point me in the right direction I would appreciate it.

Thanks,

Micah