I'd like to create a new user on my mac, so my Dad can use it when he's here. The thing is I have a slow internet connection and it took days for all of his photos to upload to the cloud. He would like to use my scanner and the plan was for him to use my mac with an account on my mac linked to his iCloud, so the photos he imports goes into the cloud and his machine back home. Can I make a copy of his photo directory on his home mac, then transfer it to mine, and then turn on photo cloud sharing to get a head start on any synching? The thought of days of downloading photos is a deal breaker I'd like to avoid.