Hi Alessandro,
Why many users skip bacula? It is powerfull and very stable. It is very difficult to setup but if you know how it works it is simple.
I used Bacula before I switched to Bareos.
There was a point, however, when the open source release of Bacula became, to put it mildly, a bit too inactive for my taste. Obviously I wasn't alone with this, because roughly at that time Bareos was forked from Bacula.
http://www.admin-magazine.com/Archive/2013/17/New-features-in-the-Bareos-Bacula-fork
Essentially, Bareos is an improved (at least IMHO) fork of Bacula, and unlike Bacuka it's fully open source.
Cheers,
Peter.