use web service to transfer multiple files at once in c#

I recently wrote a web service for E4SE, eBackoffice and PeachTree financial application (which is a financial app used by a branch office) integration, since our E4SE/EBO servers are running on our data centre while PeachTree app runs at remote office and I don't yet have the access to the remote site, I have decided to write a web service to transfer the data output. I have to point out though, the core EBO procedures were written by our colleague not by me:-)

Here are the highly summarized steps:

1. use zip lib (dotnetzip etc) to compress multiple files into 1 archive;
2. Create web service method that has a return type of byte array, read the content of the zip archive and return it;
3. on client side, call the web service and catch the returned value into a MemoryStream, flush it into filestream;
4. if neccessary, write code to extract the zip file automatically