The procedure for backup and restore of LMS 4.0 is covered in detail in the "Administration of CiscoWorks LAN Management Solution 4.0" guide.
Here is a link to the specific section.
The same procedure is also included in the online help installed on the server.
It's basically at Admin, System, Backup. If you click the help button while on that page it will open a window with the context-sensitive help.
Hope this helps.