How to Copy OneDrive Online-Only Files to an External Drive
Question details
The user needs to copy OneDrive online-only files to an external physical drive, but the transfer requires temporary local disk space which the C: drive currently lacks.
- Product
- OneDrive
- Device & OS
- Windows
- Scenario
- Transferring cloud-stored files to an external hard drive or USB flash drive when the computer's primary local drive is full.
- Observed behavior
- Attempting to copy online-only files via File Explorer triggers the Windows sync engine to download them to the C: drive first, causing a failure if the local storage is insufficient.
Ensure your external drive is properly connected to your computer, recognized by Windows, and has enough free storage capacity to accommodate the total size of the files you plan to download.
Download Files Directly from the OneDrive Website
Use your web browser to download the files directly to your external drive, bypassing the local Windows C: drive entirely.
Because the Windows Files On-Demand feature automatically caches files on your local drive when accessed through File Explorer, copying large folders can easily overwhelm a full C: drive. Downloading through the web browser allows you to choose the exact destination path before the download begins.
Open your preferred web browser, navigate to the official OneDrive website, and log in with your Microsoft account.
Browse your OneDrive directories and click the circular checkboxes in the upper-right corner of the files or folders you want to copy.
Click the 'Download' button located on the top navigation bar. If you selected multiple files, OneDrive will compress them into a single .zip file.
When your browser prompts you for a download location, navigate to your connected external drive and click 'Save' to download the files directly to that device.
Transfer Files in Small Batches
If you prefer using File Explorer, download and move files in small increments to prevent your local drive from filling up.
Edit Your Offline Documents Seamlessly with WPS Office
Once you have moved your OneDrive files to an external drive to save local storage, you need a lightweight application to open and edit them. WPS Office is a high-performance, free alternative to Microsoft Office that consumes minimal local disk space while providing full document editing capabilities.
- 1. Install WPS Office: Download and install the lightweight WPS Office suite onto your computer.
- 2. Connect your drive: Plug your external drive containing the downloaded OneDrive files into your PC.
- 3. Open and edit: Double-click your Word, Excel, or PowerPoint files on the external drive to open and edit them directly in WPS Office.
Frequently Asked Questions
Why does copying an online-only OneDrive file consume local C: drive space?
When you try to copy an online-only file using Windows File Explorer, the operating system must read the file's contents to transfer it. This triggers OneDrive's Files On-Demand feature to temporarily download the file data to your local C: drive so Windows can process the copy command.
Can I move my entire OneDrive sync folder to the external drive?
Yes, but it is generally not recommended for removable drives. You can unlink your PC in the OneDrive account settings, move the OneDrive folder to an external drive formatted in NTFS, and sign back in to select the new location. However, if the drive is disconnected while OneDrive is running, it can cause sync errors or data loss.
What happens if I turn off Files On-Demand when my hard drive is full?
If you uncheck the 'Save space and download files as you use them' option in OneDrive settings, the application will attempt to download every single file in your cloud storage to your computer. If your C: drive lacks the capacity, this will result in immediate 'Out of Space' errors and may crash running applications.
