What Is OneDrive? How It Works and Whether You Need It

If you've just bought a Windows laptop, you've probably noticed a little cloud icon by the clock and a folder called OneDrive in File Explorer, and wondered what on earth it's doing with your files. It's a fair question, because OneDrive quietly changes where your documents live. Here's what it is, how it works in plain English, and how to decide whether you want it on.

What OneDrive does, in plain terms

OneDrive is online storage from Microsoft, tied to your Microsoft account. Microsoft describes it as a way to sync files between your computer and the cloud, so you can get to them from your computer, your phone or the OneDrive website. The key word is sync. Microsoft says that if you add, change or delete a file in your OneDrive folder, the same thing happens on the website, and the other way round.

That two-way sync is brilliant when you want your files everywhere. It's also why deleting something from the OneDrive folder on your laptop removes it online too, which catches people out.

Why it's already on your computer

Microsoft says that if you have Windows 11, OneDrive is already installed. When you sign in to Windows with a Microsoft account, setup often offers to back up your Desktop, Documents and Pictures folders to OneDrive. Lots of people click through that screen without reading it, and later discover their desktop files are now inside a OneDrive folder.

The features that matter most

Feature	What it does for you
Sync	Keeps the same files on your PC, phone and OneDrive.com
Folder backup	Protects Desktop, Documents, Pictures and other standard folders
Files On-Demand	Shows all your files without downloading every one, saving disk space
Sharing	Lets you send a link to a file or folder instead of an attachment
Mobile apps	Lets you open and upload files from Android or iPhone

Files On-Demand: the part that confuses people

Files On-Demand lets you see all your OneDrive files in File Explorer without downloading all of them, which saves storage space on your computer. Microsoft marks each file in one of three ways: online-only, locally available or always available. An online-only file is just a placeholder until you open it, so it won't open if you're offline. If you're about to travel or work somewhere with poor internet, right-click the folders you need and keep them on the device first.

How folder backup works

Microsoft points out that every computer has standard folders such as Desktop, Documents, Music, Pictures and Videos that might not be included in your OneDrive. Folder backup moves those into OneDrive so they're protected and available on all your devices. You manage it from OneDrive Settings, then the Sync and backup tab, then Manage backup.

Here's the catch most people miss: when you stop backing up a folder, Microsoft asks you to choose whether to keep the files only in OneDrive or only on your PC. Read that screen carefully, because picking the wrong option can make files seem to vanish from your desktop.

Where you can use OneDrive

• Windows 10 and 11 computers, through the built-in sync app
• Mac, through the OneDrive app
• Android and iPhone, through the mobile apps
• Any web browser at OneDrive.com

Microsoft says all the apps support both OneDrive Personal and OneDrive for work or school. You can add several work or school accounts on one computer, but only one personal OneDrive account.

OneDrive Personal or OneDrive for work or school?

If you signed up with a personal Microsoft account, your files appear under OneDrive - Personal in File Explorer. If your employer gave you a work or school account, you'll see a second folder named after your company. Keep business and personal files in the right one. When you leave a job, the work folder goes with the account, not with you.

Can you turn it off?

Yes. Microsoft says the easiest option if you don't want to use OneDrive is to unlink it, and you won't lose files by doing so because they stay available at OneDrive.com. I've covered the full steps, plus hiding and uninstalling it, in a separate guide.

Is OneDrive worth using?

For most people, yes, as long as you understand what it's doing. Having your files backed up off your laptop means a stolen or broken computer is an inconvenience, not a disaster. If you already use Google tools, compare it with Google Drive before you commit to one; my guide on transferring ownership in Google Drive shows how Google handles shared files differently. And if your team is still emailing attachments back and forth, read why manual file sharing becomes a risk as you grow.

My verdict

OneDrive is cloud storage plus two-way sync, built into Windows. Leave it on if you want your files backed up and available on every device, but check which folders it's backing up and remember that deleting from the OneDrive folder deletes online too. If you don't want it, unlink it rather than fighting it.

Frequently asked questions

What is OneDrive used for?

OneDrive stores your files online and syncs them across your computer, phone and OneDrive.com, so you can open them anywhere and keep a backup off your device.

Is OneDrive already on my computer?

If you have Windows 11, Microsoft says OneDrive is already installed on your PC.

If I delete a file from OneDrive on my PC, is it deleted online?

Yes. Changes in your OneDrive folder, including deletions, sync to the OneDrive website and the other way round.

What does online-only mean in OneDrive?

It means the file is stored in the cloud and only downloads when you open it, which saves space but needs an internet connection.

Will I lose my files if I stop using OneDrive?

Microsoft says unlinking OneDrive doesn't lose files or data. You can still reach them by signing in at OneDrive.com.