We have two designers both using iMacs, running macOS Sierra; each have their own 4TB USB hdd. The designers have to transfer files to each other frequently over AirDrop but this is tedious.
What would be the best way to have the drives automatically sync files on both drives?
We've done some searching but most of the scenarios are only one working drive syncing to a back up. In our case both drives are being used and files are being created and edited on each. Essentially I would like something like a synchronized ftp or a remote source control, something that automatically updates files that are changed on either drive and creates/deletes files. Bonus points for adding a third external into the mix that is used just to have a offline backup of all files.