Hi, not sure where to put this so I'm going for the OS X forum. I've long held off the idea of updating iPhoto 8.1.2 to 9.5.1 but today I did it. My lib is 108gb. It's backed up by time machine. However, since the update, my time machine has failed twice. I *think* this is maybe cos it thinks the whole lib file has been modified and therefore needs backing up. Is this right? What can I do about this?