I have had a look on the forum to see if there are any posts on this, but couldn't find any. I have about 8000 photos on APT and find it to be a great product. I've recently backed up my MAC on time machine and have decided to delete all the photo's off my MAC.(Need more space) Question is if i Sync the current photos on my mac WILL i loose all of the exsiting photos on APT? my finger is on the button...!