You can find the following things on this FTP site:

* Debian mirror in the subdirectory `debian'.

* Debian non-US mirror in the subdirectory `debian-non-US'.

* Mirror of Debian incoming queue in the subdirectory
  `debian-incoming' (non-US in `debian-incoming-non-US').

* The directory `debian-czsk' containing data, which are not part of
  Debian, but related to the Debian CZ/SK project.

* The directory `debian-czech' containing Debian with Czech
  translation of package descriptions.