Before you begin backing up you will need to know your system so as to determine what is essential to backup and what is not.
You can do a backup on to your CD burner and keep it on a disc 961.
You could partition your HD and backup to that.
With the tape backup system you should have been able to configure it to do a scheduled backup.
With all backup's though it is advisable to keep the backup copy in a safe place away from your computer.