Hi,
Don't know if you've already figured this one out but I needed to back up my phone's call and text data for exactly the same reasons. I managed to do it with BitPim.
http://www.bitpim.org/I ended up buying a little cable (Micro USB to USB Data Cable from Verizon) to connect the phone to my Mac. I think it could also be done via Bluetooth but I couldn't quite make it work.
The important thing that I discovered is that once you've installed the BitPim software AND managed to get BipPim to discover and start communicating with your phone - you MUST actually ask BitPim to begin retrieving data to see anything. Just go to Data > Get Phone Data and a window with a list of sources to retrieve from your phone.
Happy hunting and good luck in court.
Peace,
Glenn
