It's the size of those files that matters to performance, not the size of the library as a whole. As already noted, the library is made up of individual files. There is no published maximum library size. My Photos library is over 300 GB, and there are no performance issues.
![]() How Big Is Photos Library Good For Download On DemandICloud Family Sharing (see Share Family Photos), iCloud Photo Sharing, and third-party tools (discussed in this chapter) can partially address this problem, but with numerous qualifications. (For more details and tips, see my TidBITS article iCloud Photo Library: The Missing FAQ.)Unfortunately, Apple currently offers no good way for two or more people to keep their photo libraries in sync with each other, whether they’re using the same Mac (with different user accounts) or different Macs. One catch is that depending on the size of your library, you may have to pay Apple for additional iCloud storage. Any edits or organizational changes sync across all your devices, too (with some qualifications see What Doesn’t Sync). (To learn about My Photo Stream, which sync only recent photos among your devices, see the previous chapter, Sync Photos and Videos across Devices.)With iCloud Photo Library, you have just one photo library, which is stored in the cloud your individual Macs and iOS devices can store copies of all those photos (space permitting), optionally optimized to use less storage—with full-resolution originals available for download on demand. Thanks to iCloud Photo Library, this is now possible, and it’s what I describe in this chapter.What Doesn’t SyncPer this Apple support article, certain kinds of metadata don’t sync across devices when using iCloud Photo Library:ICloud Photo Library is the best way to sync all your photos between Macs, but there are other ways to approach the task, each with its own limitations: You can also view, upload, or download iCloud Photo Library photos in the Photos Web app on the iCloud Web site. To keep all your originals on the device (space permitting), leave Download Originals to this Mac (OS X) or Download and Keep Originals (iOS) selected.Alternatively, select Optimize Device Storage to keep smaller versions of the photos on your device to save space—the app downloads larger versions as needed.Once you’ve done this on each device, photo libraries will begin syncing with each other. ① Turn on iCloud Photo Library here.Alas, this is a one-shot, manual process. Merge libraries: PowerPhotos lets you merge two Photos libraries (even from two different users) into a new library, maintaining albums and most metadata ( see exceptions) while eliminating duplicates. But the app can sync only individual, user-created albums—not smart albums or entire libraries. Aptoide apk download for android old version uptodownOnly one user can have a given library open at a time. Putting it on an external drive—and, presumably, shuttling the drive between users—should work. Apple recommends against using network storage, because it can lead to (among other problems) corruption and data loss. Share Libraries with OthersI said Apple currently offers no good way for two people to share the same complete Photos library, but there is a way to sort of do it, as described on this Apple support page (the instructions are for iPhoto but they work for Photos too.) The workaround involves working from an external drive that other users can also access. Since Apple is no longer distributing iPhoto, I don’t cover it in this book.
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