As I have said before install the mega.nz client. There is a feature to 'copy/replicate' to their servers in encrypted form. Hence a backup is created. I can't believe this is STILL going on with no solution when there is plenty options available. I bet OP hasn't even tried it. It only takes the client to be installed on a windows machine or mac to replicate photos to another machine and it doesn't need to be a mac.