This chapter covers the basics of manual backups for small systems. However, once you get into larger operations, there is much more to explore:
Automated backups. Amanda (http://www.amanda.org/) is a popular, powerful, and free automatic network backup package (that is, after you figure out how it works).
Tape changers. The Linux mtx command can operate a tape changer and autoloader.
Backups with Samba.
Commercial backup systems such as BRU.
Database backup systems (Oracle and the like).
A good, comprehensive, and detailed guide to backups ( especially for large organizations) is Unix Backup and Recovery [Preston].