In addition to the basic Unix backup utilities there are a number of commercially available backups packages and additional freely available Unix backup utilities.
The comp.arch.storage FAQ: Part 2, section 4.2 contains the following list of commercially available backup packages.
APUnix - FarTool
Cheyenne - ArcServe
Dallastone - D-Tools
Delta MicroSystems (PDC) - BudTool
Epoch Systems - Enterprise Backup
IBM - ADSM (Adstar Distributed Storage Manager)
Hewlett Packard - OmniBack II
Legato - Networker
Network Imaging Systems
Open Vision - AXXion Netbackup 2.0 Software www.ov.com
Software Moguls - SM-arch
Spectra Logic - Alexandria
Workstation Solutions
Three of these products; ArcServe, OnmiBack, and Networker are used on the IU campus.
The Unix Guru Universe includes a list of public domain backup utilities. There are also a number of public domain backup utilities for Linux.