{"id":"mac-storage-basics.what-is-an-os-update-snapshot","url":"/faq/mac-storage-basics/what-is-an-os-update-snapshot","category":{"id":"mac-storage-basics","title":"Mac storage basics"},"subcategory":{"id":"purgeable-snapshots","title":"Purgeable space and local snapshots"},"question":"What is a com.apple.os.update snapshot?","alt_questions":["com.apple.os.update snapshot delete","update snapshot mac","snapshot after software update","can I delete os update snapshot"],"short_answer":"A snapshot macOS takes when installing an update so it can finish or roll back safely. It's managed by macOS and often required; leave it alone.","answer_markdown":"macOS takes a snapshot of the system when it installs an update, so it can complete or roll back the update safely. You'll see it named with **com.apple.os.update** in Disk Utility or `tmutil` listings.\n\nIt's managed by macOS and is often required — leave it alone. Snapshots you can safely release are the Time Machine ones (named com.apple.TimeMachine). Storage Studio's Local Snapshots window marks system-required snapshots and never removes them.","answer_html":"

macOS takes a snapshot of the system when it installs an update, so it can complete or roll back the update safely. You'll see it named with com.apple.os.update in Disk Utility or tmutil listings.

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It's managed by macOS and is often required — leave it alone. Snapshots you can safely release are the Time Machine ones (named com.apple.TimeMachine). Storage Studio's Local Snapshots window marks system-required snapshots and never removes them.

","answer_text":"macOS takes a snapshot of the system when it installs an update, so it can complete or roll back the update safely. You'll see it named with com.apple.os.update in Disk Utility or tmutil listings.\n\nIt's managed by macOS and is often required — leave it alone. Snapshots you can safely release are the Time Machine ones (named com.apple.TimeMachine). Storage Studio's Local Snapshots window marks system-required snapshots and never removes them.","tags":["snapshots","macos update"],"related":[{"id":"mac-storage-basics.what-are-local-snapshots-on-a-mac","question":"What are local snapshots on a Mac?","url":"/faq/mac-storage-basics/what-are-local-snapshots-on-a-mac"},{"id":"mac-storage-basics.how-do-i-delete-local-snapshots-on-a-mac","question":"How do I delete local Time Machine snapshots on my Mac?","url":"/faq/mac-storage-basics/how-do-i-delete-local-snapshots-on-a-mac"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"What is a com.apple.os.update snapshot? — Storage Studio FAQ","description":"A snapshot macOS takes when installing an update so it can finish or roll back safely. It's managed by macOS and often required; leave it alone.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"Mac storage basics","path":"/faq/mac-storage-basics/"},{"name":"What is a com.apple.os.update snapshot?","path":"/faq/mac-storage-basics/what-is-an-os-update-snapshot"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/mac-storage-basics/what-is-an-os-update-snapshot","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"What is a com.apple.os.update snapshot?","alternateName":["com.apple.os.update snapshot delete","update snapshot mac","snapshot after software update","can I delete os update snapshot"],"acceptedAnswer":{"@type":"Answer","text":"macOS takes a snapshot of the system when it installs an update, so it can complete or roll back the update safely. You'll see it named with com.apple.os.update in Disk Utility or tmutil listings.\n\nIt's managed by macOS and is often required — leave it alone. Snapshots you can safely release are the Time Machine ones (named com.apple.TimeMachine). Storage Studio's Local Snapshots window marks system-required snapshots and never removes them.","url":"https://storagestudio.us/faq/mac-storage-basics/what-is-an-os-update-snapshot"}}]},"fragment":"
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Mac storage basics · Purgeable space and local snapshots

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What is a com.apple.os.update snapshot?

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Short answer: A snapshot macOS takes when installing an update so it can finish or roll back safely. It's managed by macOS and often required; leave it alone.

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macOS takes a snapshot of the system when it installs an update, so it can complete or roll back the update safely. You'll see it named with com.apple.os.update in Disk Utility or tmutil listings.

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It's managed by macOS and is often required — leave it alone. Snapshots you can safely release are the Time Machine ones (named com.apple.TimeMachine). Storage Studio's Local Snapshots window marks system-required snapshots and never removes them.

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