Turns out that Photos does pretty sophisticated library management; enough so that you're not duplicating space if you're migrating from iPhoto or Aperture. If you've migrated an existing iPhoto or Aperture photo library to Photos, Photos creates a brand new library structure but doesn't, in point of fact, duplicate your images. Instead it creates links to the original and preview versions of your images.
Dec 27, 2015 Added: After you delete the Photos Library from your Mac you can only access the photos in iCloud using the web interface and the Photos.app on the www.icloud.com page. You cannot access iCloud Photo Library using Photos on your Mac, unless you make a photos library on an external drive your System Photos Library.
When you're looking at your Photos library in the Finder, it includes all of your original images and previews. But the images exist only in one location on your hard drive, even if you have multiple photo libraries.
Here's what Apple has to say for people anxious to pull the delete trigger:
Watchtower library 2016 download mac. Jesus told his apostles that those two basic items symbolized his perfect body and blood, which he would soon offer up in their behalf.
After you migrate your iPhoto or Aperture library to Photos, you might feel tempted to delete your original iPhoto or Aperture library. Because the migrated library takes little additional space, you don't need to delete the original library.
So don't do it, even if you're tempted to.
You can still use your original photo library with iPhoto (version 9.6.1, as of this writing) and Aperture (version 3.6) after you've migrated it to Photos. Just bear in mind that any changes you make in iPhoto or Aperture will be resident only in those applications, not Photos. So if you make new image edits in Aperture or create a new iPhoto album, those will only appear in their respective apps, not Photos.
(Hat tip: Dave Sanderson)
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