This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
HP's OmniBack II runs on several different platforms, and splits the functionality up. The Backup manager appears to run only on NT, but it can use devices attached to various flavors of Unix, and backs up ten different kinds of Unix and PC clients. Now marketed jointly with OmniStorage, their HSM system, in a (sales) program they call OpenView. See http://www.hp.com/go/openview. (rdv, 98/1/16)