i would just use an RJ45 lead to link the two computers together and transfer everything over that. its not the easiest thing in the world to set up, but once its going its pretty fast.

ANECDOTE ALERT: i use my brothers computer as a backup device and he doesn't even know about it. his computer is on the other side of the house so i needed a very long  RJ45 lead. now, me being a skint tightwad i couldn't buy one from a shop.  i did however have a 1m one i 'borrowed' from school. so i cut it in two and used 2 lenghts of old phone wire to go between the two ends. RJ45 uses 8 wires and phones use 4, so i needed 2 lengths of phone wire. in the end i used 20 meters of phone wire, lots of solder, lots of knots and lots of insulating tape where i made the joins. it cost nothing and only took 1/2 an hour to do, and it works perfectly. now me and my spend hours playing unreal  tournament against each other and i have gained an extra 160GB of storage space.