OneDrive File Issues

How to Make OneDrive Files Available Offline on an External Device

Phi Hung Vo Sep 29, 2026 869 views

Question details

The user wants to sync OneDrive files to an external storage device for offline access and resolve potential synchronization or storage space issues.

How to Make OneDrive Files Available Offline on an External Device

Product: Microsoft OneDrive
Device & OS: Windows, Mac
Scenario: Saving cloud files permanently to a portable external drive so they can be accessed without an internet connection.
Observed behavior: Files need to be manually marked for offline use and fully synced to the external drive. Occasionally, synchronization gets stuck, or system data usage spikes on macOS.

Before you start

Ensure your external drive is securely connected to your computer, correctly formatted (NTFS for Windows or APFS for Mac), and has sufficient free space to accommodate the OneDrive files you plan to download.

Solution 1Recommended

Mark OneDrive Files to Always Keep on This Device

Use this primary method to download OneDrive files directly to your external drive for permanent offline access.

Windows and Mac operating systems support the 'Files On-Demand' feature, allowing you to choose which files remain in the cloud and which are downloaded locally.

Locate your files

Open File Explorer (Windows) or Finder (Mac) and navigate to your OneDrive sync folder.

Select files for offline use

Right-click the specific files or folders you want to save to your external device.

Enable offline access

Select 'Always keep on this device' from the context menu. The status icon will change to indicate the files are downloading.

Wait for synchronization

Wait for the download to complete (indicated by a solid green checkmark icon) before you disconnect the external device.

Mark OneDrive Files to Always Keep on This Device

Verification: A solid green circle with a white checkmark confirms your files are physically stored on the device and accessible offline.

Solution 2

Troubleshoot Incomplete Synchronization

Use this solution if your files are stuck syncing or fail to download to the external device completely.

Solution 3

Clear Cache to Fix Mac Storage Issues

Apply this fix if you are using a Mac and notice that OneDrive system data is unexpectedly consuming a massive amount of local storage.

Free Microsoft Office alternative

Edit Your Offline Office Files with WPS Office

Once your OneDrive documents are safely synced to your external drive, you need a reliable suite to view and edit them offline. WPS Office is a highly compatible, free alternative to Microsoft Office that perfectly handles your local Word, Excel, and PowerPoint files without requiring an internet connection.

1. Download and Install: Visit the official WPS Office website and download the free installation package for your Windows or Mac computer.
2. Open External Drive Files: Launch WPS Office, click 'Open', and navigate to your external drive to select your offline OneDrive documents.
3. Edit and Save Locally: Edit your documents normally and click 'Save'. Changes will be written directly to your external drive and synced to OneDrive once you reconnect to the internet.

Completely free and lightweight office suiteStrict format compatibility with Microsoft Office (DOCX, XLSX, PPTX)Edit offline files directly from your external hard drive with easeFamiliar tabbed interface ensures a seamless transition and zero learning curve

microsoft office alternative - wps office

Frequently Asked Questions

How do I know if my OneDrive files are successfully available offline?

Look at the status icon next to the file or folder in File Explorer or Finder. A solid green circle with a white checkmark indicates that the file is permanently downloaded to your device or external drive and is available offline.

Can I set an external drive as my default OneDrive sync folder?

Yes. When you first sign into OneDrive (or after unlinking your account), you can click 'Change location' during the setup process and select a folder on your external drive. Ensure the drive is formatted correctly (NTFS for Windows, APFS for Mac).

Why does OneDrive still require an internet connection after I connect my external drive?

If files were left as 'Online-only' (cloud icon) rather than 'Always keep on this device', they are not physically on the drive yet. You must right-click them and select 'Always keep on this device' while connected to the internet to fully download them.

Document & File Issues