My 2 TB HD (up to date El Capitan) is almost full. I like iPhoto and have about 60k images stored there. It's just a library for me since I edit them in PSE. I've also been downloading images to Photos but just don't see it as a good option for me right now and as long as I can use iPhoto there's no reason to use both apps. At least for the short time, I'd like to delete images from Photos and keep everything in iPhoto until I figure out a better system for me. I need more HD space and only use the app as a place to store the images. So, I'm wondering if the images are actually duplicated when downloaded to both iPhoto and Photos or is one image tagged to both apps. If so, I'm guessing I wouldn't free up much HD space by deleting Photos. Thanks. Any thoughts or suggestions: greatly appreciated.