How can i work with and transfer files between 2 iMacs that are running different OSs? One imac is on SnowLeopard and the other is on Yosemite. What can i do in order to be working from one (SnowL iMac) with the files that are in the other (Yose iMac)? I must note that the two iMac are not connected to each other through any kind of network they are both distant and the only connectivity available is a dsl line for each!