How to upload to other server?

Hi all,

I host website have ckfinder in serverA (run local). I want upload image to server B (map with my domain)

I try map network drive server B on Server A (\\serverB\\Shares => Z:\\) but can't upload :(

i set in config 

BaseUrl = "http://mydomain/"
BaseDir = "\\ServerB\\Shares\\" => it wil create folder ServerB\Shares in C:\
BaseDir = "Z:\\" => System.IO.DirectoryNotFoundException: Could not find a part of the path 'z:\images/'.

Pls help me... many thanks...