I will definitely try this because she has a lot of photos and video it’s taking forever . I’ll keep you guys posted .The speed is partly the upload but also partly due to indexing and processing the file for inclusion into the two app libraries. Moments is particularly heavy on the processing when analysing the various types of tagging and face recognition.
You could connect the phones to the Mac with USB and use Image Capture to copy off the photos. Then copy these photos to a folder on the NAS ... any folder in your personal Moments folder will do. For Photo Station I messed with it yday and found it needed to create the folder in ..../photo itslef when creating an Album. If your wife has already got a folder for the backup then copy from Mac into that.
Before doing this you should stop the current backups and when the photos have been copied in then start them but select to only backup new items from now.