Apr 17, 2015 Mac users coming from iPhoto may wish to move an iPhoto Library to the new Photos app. While importing is an option when first setting up the Photos app in OS X, many users many have skipped the initial setup screens and missed that opportunity to import pictures and images into Photos from apps like Aperture and iPhoto. The problem is, that both libraries are sharing the same image files. While the image files are still in use in the old, migrated library, deleting the same photos from your new Photos library will not free any storage, because the old library is still needing the files. SO removing the library to a different drive will definitely help. If you have iCloud Photo Library and want to back up all your photos to a storage device attached to your Mac you can follow the guide above, but you will need to add the step of downloading the. Aug 24, 2015 If you’re using the new Photos app on your Mac instead of the older iPhoto app, you most likely have a duplicate photo library floating around on your hard drive. For a lot of people, that could mean gigs and gigs of wasted storage space, especially on shared Macs with multiple migrated libraries.