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Message: <blockquote data-quote="Rod" data-source="post: 1893239" data-attributes="member: 204485">Well, theoretically you should be able to restore the Photos Library via Time Machine to its state prior to the removal of those 900+ pictures but because you don't know how that happened and adding in the fact that you upgraded macOS about the time you think it happened I cannot be sure it would work.It is possible that the upgrade to a newer version of Photos may have caused a problem with the library.  It's bedtime here now so I'll do some research tomorrow and get back to you.  Ian might have more thoughts on the topic, he's closer to your time zone I think.<img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up    :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/6.5/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /></blockquote>