If you type "ntbackup" in the Help and Support program and look at the topices under "Suggested Topics" you may find something you can use?
"Using batch files to back up data.
You can perform backup operations from batch files using the ntbackup command followed by various command line parameters. However, there are two important limitations to using batch files to back up your data:
Using the ntbackup command, you can back up entire folders only. You cannot designate individual files for backup. However, you can designate a backup selection file (.bks file) from the command line, which contains a list of files you want to back up. You must use the GUI version of the Backup utility to create backup selection files.
The ntbackup command does not support the use of wildcard characters. For example, typing *.txt will not back up files with a .txt extension.
Command line examples.
The following examples show how to use the ntbackup command to back up files and folders from the command prompt or by using a batch file."
The examples are in Help and Support.