The default SI Server folder is: C:\DToolsSIXData.
To change the Server folder:
1/ Open your SI Server Manager and stop the SI service.
2/ Open Notepad with the Run as administrator option.
3/ In Notepad, open the following file (default location)
C:\Program Files (x86)\D-Tools\SIX\Server\ServerSettings.xml.
4/ Change the DataFolder XML node to your new folder path.
5/ Save the file.
6/ Copy the contents of the old SI Server folder to the new Server folder.
7/ Restart your SI service.