I'm perhaps inordinately pleased about this deal.. Worst case, solid backup. Best case, starting CB.
Back in 06, I used to like Zaccardo as he was a rare defensive fullback - strong in fundamentals and not risking too much. And then came that own goal in front of the world which more or less ruined his career ascent. Oddo took his opportunity very well, and Zaccardo faded away for a few years.
I haven't watched much of Parma recently, but Zaccardo back in 2006 was a better, more rounded defender than Acerbi or Bonera and less error-prone than Mexes. And Parma has been doing well with their 3-man defense.
So basically, this may be a jackpot deal (Best case scenario - Kinda similar to Juve's Barzagli deal). I would certainly try out Zaccardo in the center for a couple of matches. If it clicks, brilliant. If it doesn't, we have a reliable backup fullback (more solid than Abate/Antonini/Mesbah) who can play on either flank.
Welcome, Zaccardo.