What is OneDrive?
OneDrive is your personal cloud storage in Microsoft 365. It's like a hard drive that lives in the cloud -- you can save files from any device, and they're available everywhere you sign in. Think of it as your own file cabinet that follows you between your phone, your computer, and any web browser.
OneDrive vs SharePoint
OneDrive is for your personal files -- documents, photos, and anything you upload yourself. SharePoint is for team files that belong to a group or the whole company. When someone shares a file or folder with you through Teams or Outlook, that file usually lives in SharePoint. Your own uploads go to OneDrive.
Storage Limits
1 TB is enough for hundreds of thousands of photos and documents. You're unlikely to run out unless you're storing large video files.
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How OneDrive Sync Works
When OneDrive is running on your desktop, it keeps a OneDrive folder in File Explorer that mirrors what's in the cloud. Save a file there and it automatically uploads. Edit it on another device and the changes sync back. It's like Dropbox, but built into Windows and connected to your Microsoft 365 account.
Files On-Demand
OneDrive uses Files On-Demand to save space on your computer. You'll see cloud icons next to files that are stored online only:
☁️ Cloud icon -- File is online only (doesn't take up disk space). Double-click to download it when you need it.
✅ Green checkmark -- File is downloaded and available offline.
🟢 Green circle with white checkmark -- File is set to always stay on this device.
Right-click any file → Always keep on this device to make it available offline, or Free up space to move it back to online-only.
Set Up Sync
Desktop Feature
OneDrive sync is a desktop feature that keeps files in your File Explorer automatically in sync with the cloud. On mobile, the OneDrive app gives you access to all your files without needing sync -- just open the app and browse your files. Any changes you make on mobile (uploads, edits) are automatically available on your desktop and vice versa.
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