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Cloud Storage Management

Fix sync issues, free up local disk space, and resolve conflicts in iCloud Drive, Google Drive, OneDrive, and Dropbox

Cloud storage is supposed to save you space, but it often does the opposite – syncing everything to your local drive until your disk is full. This guide covers how to free up local space with selective sync, fix files that will not sync, and resolve those annoying conflict copies.

iCloud Drive – stop it from filling your disk:

  1. Open System Settings and click your name at the top (your Apple ID)
  2. Click iCloud, then click iCloud Drive
  3. Enable Optimize Mac Storage. This keeps only recently opened files on your Mac and stores everything else in iCloud, downloading files on demand when you open them
  4. To check what is using iCloud space, go to System Settings > [Your Name] > iCloud > Manage Account Storage

When Optimize Mac Storage is on, files you have not opened recently show a small cloud icon in Finder. They download automatically when you open them and may be offloaded again when your Mac needs space.

If your Mac says the disk is full even though you have iCloud storage, it is because iCloud is syncing everything locally. Turning on Optimize Mac Storage is the fix.

Google Drive – stream instead of mirror:

  1. Click the Google Drive icon in your menu bar and click the gear icon
  2. Go to Preferences
  3. Under Google Drive, choose Stream files instead of Mirror files. Stream mode keeps files in the cloud and only downloads them when you open them. Mirror mode downloads everything to your Mac
  4. To make specific files always available offline, right-click them in Finder and select Available offline

If you were previously mirroring and switch to streaming, Google Drive will remove the local copies and free up disk space. Your files are still safe in the cloud.

OneDrive – use Files On-Demand:

  1. Click the OneDrive cloud icon in your menu bar
  2. Click the gear icon and go to Preferences
  3. Under the Sync and back up tab, make sure Files On-Demand is enabled (it usually is by default)
  4. In Finder, right-click any OneDrive file or folder and choose Free Up Space to remove the local copy while keeping it in the cloud

File status icons in Finder: a blue cloud means online only, a green checkmark means downloaded locally, and a white circle with a green checkmark means always available offline.

Dropbox – use selective sync:

  1. Click the Dropbox icon in your menu bar and click your profile icon
  2. Go to Preferences > Sync
  3. Click Selective sync and uncheck folders you do not need stored locally. These folders stay in Dropbox's cloud but are removed from your Mac
  4. Alternatively, enable Smart Sync and set it to Online only to keep files in the cloud by default

Fix sync conflicts on Mac:

When a file is edited on two devices before syncing, you get a conflict copy. Here is how each service handles it:

  • iCloud Drive: Creates a file named "filename (conflict copy)" or "filename 2". Open both files, keep the one with the changes you want, delete the other
  • Google Drive: Shows a sync error notification. Click the notification to see the conflict. Usually the most recent edit wins, and the other version is available in version history
  • OneDrive: Creates a copy with the device name appended. Check both files and keep the correct one
  • Dropbox: Creates a "conflicted copy" file with the date and device name. Compare both versions and delete the duplicate

To avoid conflicts, let sync finish before editing a file on another device. If the sync icon is still spinning, wait.

Frequently Asked Questions

Why is my disk full when I pay for cloud storage?▾

Cloud storage and local storage are different things. By default, most cloud services sync files to your computer so you can access them offline. This means those files take up space on your local drive and in the cloud. The fix is to enable "stream" or "on-demand" mode so files stay in the cloud and only download when you open them.

What happens if I delete a file from my cloud folder?▾

It gets deleted from the cloud and all your other devices too. Sync goes both ways. If you want to remove a file from your computer without deleting it from the cloud, use "Free up space" (OneDrive), switch to "Stream files" (Google Drive), or use "Online only" (Dropbox Smart Sync). Do not just delete the file from the folder.

Is it safe to use online-only mode? What if I lose internet?▾

Files in online-only mode require an internet connection to open. If you need certain files available offline (like when traveling), right-click them and choose "Always keep on this device" or "Available offline." Everything else can safely stay online-only. If you lose internet, you just will not be able to open those cloud-only files until you reconnect.

How do I fix a file that is stuck syncing?▾

First, check your internet connection. Then try pausing and resuming sync in the cloud app's settings (usually accessible from the menu bar or system tray icon). If a specific file is stuck, try renaming it or moving it out of the sync folder and back in. As a last resort, sign out of the cloud app and sign back in.

Can I use multiple cloud storage services at the same time?▾

Yes, and many people do. Just be careful not to sync the same files to multiple services, as this doubles (or triples) the local storage used and can create conflicts. Pick one service per purpose: for example, iCloud for photos and OneDrive for work documents.