Have you considered doing it pc-route? Then, there are several clients available, free or under $50 that will do the job. I needed HIPAA compliant transfer of documents using SFTP, and went PC route due to cost. I didn't need to zip, so once documents are in an IFS directory, trnasfer is just a click away. If you want to zip, you will need to transfer to pc first unless you use zip on 400.