Creating new Mac photo library
My Mac photo library is corrupted and can’t be repaired. If I create a new system photo library can I simply download all my pics from iCloud. I’m very worried that I might corrupt my iCloud library.
MacBook Pro
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Backup the old library. Even corrupted, the library can be mined for old pictures-- just in case.
iCloud is pretty good about not letting suspicious files through its pipeline, so you should be OK. Just option-click on Photos and create a new Library. In In Preferences (or Settings) make this your System Library and turn on iCloud. It will start to populate your new library with pictures from iCloud. It may take weeks to finish, depending on the size of your library.