• I've migrated from using iPhoto to Photos.app on the Mac.
  • I am using iCloud Photo Library
  • I have both a MacBook and an iPhone connected to the iCloud Photo Library
  • Both devices have the Optimise [Device] Storage setting enabled

I've read this page from Apple, so I know that although Finder shows both the iPhoto and Photos libraries as 'using' a similar amount of storage, they're actually sharing the same, underlying image files.

I'm also aware that after migrating from iPhoto to Photos, I can continue to use iPhoto, but any changes there will not be reflected in Photos...

My question originates from the point at which I turned on Optimise Mac Storage on the Mac...

The MacBook in question is low on storage, so, as I continue to add photos (for example, I've imported some from an external drive), the overall space available on the Mac's HD is being kept in check by the optimise setting.

When I originally opened Photos.app, both the iPhoto and Photos libraries, in Finder, were roughly equal at ~25 GB. After turning on the optimise setting and importing new photos into Photos.app, you can see in the image below, the Photos Library is now lower, at 17.8 GB:

enter image description here

  • Will iPhoto hang on to the 25 GB?
  • Can iPhoto work alongside the optimise storage setting?
  • At some point, the iCloud Photo Library optimisation may decide to move older photos off the Mac, that are in that iPhoto Library... what happens then?

Note: the Mac in this situation belongs to my wife. I'm keeping iPhoto around for a while, during the transition (some photo books being worked on, etc.). So it's kinda academic, because sooner or later I won't need iPhoto. But I'd be interested if anyone knows how the local library works alongside iCloud Photo Library, with optimise turned on.


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