From FCKeditor Docs

Repository Directory

The configuration file contains settings to point the connector to the directories in the File System where to upload and retrieve files and folders requested by CKFinder.

Each “Resource Type” may point to a different directory.

Two related settings can be used to set the target directory: “url” and “directory”. The “directory” attribute can be used to point to the server path of the directory, while “url” points to the public URL that points to “directory”. If “directory” is not defined, the connector must try to resolve it based on “url”.

The connector must create the configured folders if necessary.