The following is a sample batch file you can use for backing up your files while the server remains online.

rem ** 3/7/96 Backup Written by <name>
rem ** This will back up the information store and directory service on
<server_name 1> and <server_name 2>.
ntbackup backup DS \\Server_name1 IS \\Server_name1 /v /d "Server-name1
IS-DS" /b /t Normal /l c:\winnt\backup.log /e
ntbackup backup DS \\Server_name2 IS \\Server_name2 /a /v /d
"Server_name2 IS-DS" /b /t Normal /l c:\winnt\backup.log /e
exit