Ok so I have a 2009 Mini which I am giving to my son, and I now have a 2010 Mini. I have been using Time Machine to back up the 2009, and now need to restore the backups to my 2010, both Machines are named MacMini. 1) Is it easy to restore from one machine to another or is there some sort of signature that Apple writes based on hardware when backing up in machine? 2) Once I get the new one restored, can I keep using the existing external drive or should I reformat it so I have a Clean disk for Time Machine. I have never had to use TM to restore before so I was trying to figure out what I should do.