SafeBack is not free software. A quick Google search brings up their web site:

http://www.forensics-intl.com/safeback.html

"In 2000 New Technologies, Inc. (NTI), a subsidiary of Armor Holdings, Inc. (NYSE:AH) purchased the rights to SafeBack from Sydex, Inc. "

This tool is also mentioned in _Scene of the Cybercrime_ and I had already checked on the availability of the tool. It is possible that Sydex, Inc. did have a freebie version prior to being acquired.