Sorry Richard, to remove abiguity and to try and make clear my purpose.
At the moment I pay iCloud one fee, for up to 6TB storage, my phone contact includes up to 2TB iCloud storage, So if I can keep iCloud under 2tb, and change my mobile phone contract I will make a considerable saving each month.
Therefore, I would like to remove the oldest images from iCloud , which I no longer need on a regular basis and store them on the external HDD, reducing my overall iCloud storage. I bought the WD My passport because I understand when formatted to Apple, the external HDD, behaves in the same way as iPhotos/ iCloud (where you may have saved an imaged cropped, but can retrieve the original when you go into edit it again.
The problem I have is that my MacBook is only 256GB, to download the images in the correct format, I need to download them to iPhotos and then move them across. As we know MacBook storage is never really 256, and available space is around 80GB, so this would be a painfully slow process.
I am looking for an alternative work around, if you can think of one. They are grouped in folders, which is my last alternative, where I export the drone images / videos and everything that is't a 'Live Photo' in its original format but would love to keep everything in the same order as I have it stored on the cloud.
Any help would be greatly appreciated.