Couldn't have said it better. Just copy the raw files with no compression at all.

Also, if the script on the user's desktop will decompress the script ont he fileserver, then your bandwidth usage will go though the roof. The reaosn is that the ZIP file will be transmitted back tot he user's desktop for the decompression in local memory and then the unZIPed files will be transmitted back to the fileserver. Therefore, the user's script should not do anything on the remote fileserver like decompressing.
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