navision 3.60 withsqlserver 2000 - shadow db

Hi! i have a windows server 2003 with sqlserver 2000. there is my navision database running. i want to make a second sql server under windows 2000 (backup server). here one time the week the original database should be shadowed for backup reasons. also when the real server is not running I want to switch my users for read only mode to that backup sql 2000 server. what are the steps for me to do. who has an idea? thanks!