Transferring photos to new iMac
I have recently bought a new 2019 iMac to replace one from 2011. All that I am really interested in transferring is a huge photo library (120gb 20,000 photos).
I have tried uploading to iCloud but after almost a week only 10gb has been uploaded.
How do I transfer all my old photos so that they seamlessly join my current collection in photos on my new Mac?
Thanks
iMac Line (2012 and Later)