Your Internet Consultant - The FAQs of Life Online

6.12. I can't seem to send a file to a mirror of my favorite FTP site. Why not?

Although mirror sites are useful for receiving files available on popular anonymous FTP hosts, they can't be used for sending files to the mirrored host. That is, you can't send a file to a site's mirror and expect it to find its way to the original FTP site. The reason is that mirroring is a one-way exchange: A host's mirror checks in periodically to see what's changed and what new files are available at the main host, but the computer that is being mirrored doesn't check to see what's new at the mirror site. If you want to send a file to an FTP site, you'll have to send it directly to that site, not to one of its mirrors. 
ftp.mirror-2.com
             ^
             |            
      ftp.big-bob.com   ----->  ftp.mirror-1.edu
             |
             V
     another-mirror.gov

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