How To Change The Library Used By Mac Photos
The Photos library used in macOS acts like a file when information technology's really a package, a special macOS container for holding many objects together. This prevents u.s. from accidentally moving items out of it, renaming files that need to have fixed names, or modifying documents that shouldn't exist touched. Information technology also makes the Photos library and similar libraries and app-associated file packages easier to move.
If you're migrating from 1 Mac to some other—or merely want to move your Photos library from one to another—you tin simply copy the file. On the new Mac, hold down the Option cardinal while launching Photos and you can select the library you copied over. That's the unabridged procedure.
Information technology can exist a little easier or a little more than complicated if yous use iCloud Photos. iCloud Photos lets yous sync images and videos between your Mac and iCloud and from iCloud among your other devices. While iCloud always keeps the original resolution version of any media on its cloud servers, you tin opt on each of your devices whether to shop "optimized" media or full-resolution versions.
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With the optimized selection, iOS, iPadOS, and macOS stores thumbnail previews. If y'all try to access the prototype or video to view it at full size or resolution, your device downloads the corresponding media from iCloud. Photos retains the buried full-resolution version indefinitely, deleting it only when it needs to free upwards space as storage gets tight. Those deletions happen automatically, leaving the thumbnail in place.
When you lot desire to copy or move your Photos library from one Mac to another with iCloud Photos enabled, that presents you with ii choices:
- If y'all accept optimized media enabled on your current Mac, you can simply utilize the same iCloud account on your new Mac and set Photos up for either optimized or full-resolution way. Photos automatically performs all the downloads necessary. This tin can take a while and consume a lot of Internet bandwidth.
- If you lot ready Photos to keep full-resolution downloads of all images on your current Mac, you tin also enable Photos for iCloud syncing every bit in the previous betoken. But you lot can choose instead to copy your Photos library as if y'all weren't using iCloud Photos at all.
That second option plus copying works because y'all take a full copy of all images present in your iCloud storage. It tin exist a better choice if you have a Photos library with tens of gigabytes of images or more than paired with low-speed broadband (in the tens of megabits per 2d) or a monthly usage cap beyond which you pay overage fees or take your service throttled to a lower speed.
If you copy the Photos library in that scenario and and then enable iCloud Photos on the new Mac, Photos will still appear to perform a synchronization operation. However, my analysis while testing is that only a comparing is performed instead of a full download or upload of images. Since the images volition exist identical in iCloud and in the Photos library, they should all match instead of requiring massive throughput consumption and bandwidth utilise.
1 complicating factor for both kinds of copying has to practice with referenced media: these are included in Photos every bit links to images or videos stored elsewhere on the Mac using Photos. These are not synced via iCloud Photos and won't exist copied with a non-synced Photos library, either. Read this article on working with referenced media.
This Mac 911 commodity is in response to a question submitted by Macworld reader Jack.
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Source: https://www.macworld.com/article/353744/copy-photos-library.html
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