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Feb 17, 2016 6:19 AM in response to imagecanonby léonie,If you have thoroughly tested the new Photos Library and are sure, that you need no longer to open the Aperture library to finish books, or to look up missing metadata or similar, then you can delete the Aperture Library.migrated. But better keep a backup copy on a external drive, just in case.
You will not gain much storage back by deleting the Aperture Library, however. The photos in your Aperture Library and in the new Photos Library are using the same entries in the file table. Your Photos library uses hard links to the original photos in the Aperture library. This way, it looks like you would be needing twice the storage for apparent duplicates, but the photos in both libraries are stored on the same place on your drive. The storage will only be freed, if you delete a photo in both libraries.
See: Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support
and: Six Colors: The (hard) link between Photos and iPhoto
So delete the Aperture library only, if you are very sure, that you will not need it any longer.