Yesterday I used the hard disk of my mac desktop computer in target disk mode in order to create a backup of my MacBook Pro. I think this may have been a mistake, as today when starting up my desktop it looks like it is brand new and is asking if I want to restore from a back up or use disk repair facility. I had not made a back up of the desktop computer. You may ask why? I did this as my external HDD that I normally use for back up of the MacBook Pro said it was full. I was in a rush so thought I could use the available space on the desktop computer. Now I am away on holiday and have left my wife with a the desktop mac not working. She had some photo albums on the desktop which she had put a lot of time in to produce. Can I recover the desktop to how it was before I created the laptop back up? I can ditch the laptop backup if needed as it was just a precaution while I am travelling. . I am running OSX 10.7.5 on laptop, probably similar version on the desktop. Thanks very much.