Backup over network

First off, you're not going to be able to do it using the backup application included with Win9x, as it won't recognize a CD writer as a valid backup device.

If this is a one-time backup, or only needs to be accomplished periodically, your best bet is to copy the files that need to be backed-up to a folder on the computer hosting the CD writer. Then use the CD writing software to burn the files to CD.

Another option would be to use any backup software that may have been included with the CD writer.

If you need to do backups on a frequent basis, some third-party backup solutions (like Dantz Retrospct Backup) recognize CD writers as valid backup devices. Backup across a network may require more expensive versions of the software.

Map a drive from the tower to the folder on the laptop which contains all the files you would like to have backed up. Then start your cd writing software and explore to the mapped folder.
Good luck!

Mike