---
id: icloud.what-happens-if-i-turn-off-optimize-mac-storage
url: https://storagestudio.us/faq/icloud/what-happens-if-i-turn-off-optimize-mac-storage
category: "iCloud & iCloud Photos"
subcategory: "Online-only files and Optimize Mac Storage"
question: "What happens if I turn off Optimize Mac Storage for iCloud Drive?"
alt_questions:
  - "Disable Optimize Mac Storage iCloud Drive"
  - "Download all iCloud Drive files to Mac"
  - "Turn off optimize storage not enough space"
  - "keep everything local icloud drive"
short_answer: "Your Mac downloads every file in iCloud Drive and keeps them locally, so it needs room for all of it. If you only need some folders offline, leave Optimize Mac Storage on and use Keep Downloaded for those folders instead."
tags: ["optimize mac storage", "icloud drive", "download"]
related: ["https://storagestudio.us/faq/icloud/what-is-optimize-mac-storage-in-icloud-drive", "https://storagestudio.us/faq/icloud/how-do-i-keep-an-icloud-folder-always-downloaded", "https://storagestudio.us/faq/icloud/how-do-i-download-everything-in-icloud-drive"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# What happens if I turn off Optimize Mac Storage for iCloud Drive?

Your Mac starts downloading **every** file in iCloud Drive and keeps them all locally. That needs enough free space for your whole iCloud Drive; if there isn't room, macOS may warn you or leave some files online-only.

Turn it off only if you need everything offline and have the space. Otherwise leave it on and use **Keep Downloaded** for the folders you need offline — see [keeping a folder downloaded](https://storagestudio.us/faq/icloud/how-do-i-keep-an-icloud-folder-always-downloaded). Storage Studio can make files online-only again later if space runs short.