I left Time Machine on to run last night while I was sleeping. I woke up to 12 new "2009-10-31" backup folders. It seems to be backing up a small 105kb file every hour. Obviously there is nothing else to backup because the system is idle, I'm not making any changes to files. Is this normal? I'm not sure I noticed this happen in Leopard. Any idea on what that small file is that it keeps backing up? Thanks!