For many years now, when I need to upload photos from my DSLR or iPhone, I have always manually managed my folders and drives. Currently I use a secondary internal data drive, which looks like this: G:\pictures\vegas wedding 2017 I use that as an example as ALL of my photos are in this folder, and from there on are the names of my subfolders for each photoshoot I do. Pop in the SD card, move the files to a newly created folder, done. Now I have shared my old PC on my network, and I can easily see them on my new iMac. Where I'm confused on is how it's best to migrate tens of thousands of photos over to my internal fusion drive, and then easily duplicate the photos as a backup to an external 4TB drive. In my testing so far, migrating and keeping the folder names in the Photos app creates many subfolders in the Photos directory under the Masters folders. This seems to complicate things. Or am I overthinking this and there is a simpler way?