From the home page [L1 ]:
Burt, the backup and recovery tool, is an extension for Tcl/Tk 8.0 designed to perform backups to and recoveries from tapes. A Burt installation consists of the Burt extension module and a set of Tcl/Tk 8.0 scripts to make use of that module to perform backups.
Burt can backup virtually any system imaginable because of its integration with Tcl/Tk. At the University of Wisconsin, Madison, Computer Sciences Department, we use Burt to backup about 350 workstations and a substantial AFS filespace, for a total of roughly 750 GB of data.
http://www.cs.wisc.edu/~jmelski/burt/
ZLM asks: This tool seems to be for Unix only. What are the current possibilities for reading and writing on tapes on Windows?