BIXO  Thank you Joe! Great to see have this free update and I appreciate very much the clarifications made bellow about "the file ownerships and permissions" and especially about "CS4 passing this this suite of tests: "

http://www.n8gray.org/blog/2007/04/27/introducing-backup-bouncer/

I can confirm, that the blog referred to has not been updated since years, but CS4 has. It would only be fair from the autor to remove or update the blog at http://blog.plasticsfuture.org/2006/04/23/mac-backup-software-harmful/.  
(Version 4.0)