Five gigabytes. That’s the free OneDrive allowance Microsoft gives every Windows account, and it disappears faster than you’d think once your desktop, documents and photos folders start quietly syncing in the background. We’ve had readers email us convinced their PC had a virus because Windows kept nagging about storage, when the real issue was just a OneDrive account that filled up months ago without anyone noticing.
OneDrive is one of those bits of Windows that everybody has, almost nobody fully understands, and a lot of people accidentally rely on for things it was never really built to do. That last part is where the OneDrive storage trap comes in, and it’s worth unpacking properly because the gap between what OneDrive does and what people assume it does can cost you real files, or a surprise subscription you didn’t sign up for.
What OneDrive actually does
OneDrive is Microsoft’s cloud storage service, baked into every modern copy of Windows. Think of it as a folder on your PC that also lives on Microsoft’s servers, so the same files show up whether you’re on your desktop, your laptop or the OneDrive app on your phone. Edit a document at home, open it at work, and the changes are there. That’s sync, and it’s genuinely handy.
Where people get tripped up is Windows’ habit of quietly rerouting your Desktop, Documents and Pictures folders into OneDrive the moment you set up a new PC with a Microsoft account. It’s called “Known Folder Move” internally, though you’ll never see that term in the setup wizard. Suddenly every screenshot, every downloaded PDF and every save file sitting on your desktop is counting against that 5GB free tier, and you didn’t choose it so much as click “Next” a few too many times.
Syncing is not backup, and that distinction matters
Here’s the bit we reckon doesn’t get explained clearly enough anywhere, including by Microsoft itself. Sync means your files are mirrored across devices and the cloud. Backup means there’s a separate, recoverable copy that survives you doing something dumb, like deleting a folder by accident or getting hit with ransomware.
OneDrive blurs this line deliberately, because “backup” sounds more valuable than “sync” and Microsoft would like you paying for storage either way. If you delete a file on your PC, OneDrive dutifully deletes it from the cloud too, because that’s what syncing does. It’s doing its job perfectly and still leaving you without your file. There’s a recycle bin and a version history feature that can claw things back for a limited window, which is genuinely useful, but it’s not the same guarantee as a proper backup sitting on a separate drive or service that doesn’t automatically mirror your mistakes.
We’d argue this is the single most misunderstood thing about cloud storage generally, not just OneDrive. If your entire disaster-recovery plan is “it’s in OneDrive”, you’re one ransomware infection away from finding out the hard way that sync and backup were never the same promise. For broader protection against the sort of attacks that make this matter, it’s worth reading up on the top cybersecurity threats facing Australians this year.
The five gigabyte squeeze
Five gigabytes sounds like a lot until you remember what a modern phone photo weighs, or how quickly a folder of PC game screenshots and clips adds up. We’ve seen OneDrive accounts fill up from nothing but a few months of Xbox Game Bar clips and some phone photos synced via the OneDrive mobile app. Once you hit the ceiling, Windows starts throwing sync errors, files stop updating between devices, and some folders quietly go “online-only” where the file looks present but isn’t actually downloaded to your PC until you click it.
That online-only behaviour, officially called Files On-Demand, is clever when it works and infuriating when you don’t understand it’s happening. Open a file while your internet’s down and it simply won’t open, because the actual bytes are sitting on a server, not your hard drive. For gamers specifically this gets messy around save files and mod folders; we’ve had readers chase “missing” save data for hours before realising it was sitting in the cloud, un-downloaded, while they were on a train with no signal.
Microsoft 365 and the upsell that’s actually decent value
Once you’re bumping against the 5GB limit, Microsoft’s answer is a Microsoft 365 subscription, which bundles OneDrive storage (typically 1TB on the personal tier) with the full Office apps. At current pricing this runs somewhere around $139 a year for a single person, give or take, and we’ll be upfront: unlike most subscription upsells we grumble about on this site, this one’s genuinely reasonable value if you were going to buy Word and Excel licences anyway.
Where it gets less reasonable is for people who only wanted more cloud storage and didn’t want Office at all. You can buy OneDrive storage on its own, but it’s not always obviously signposted next to the Microsoft 365 bundle, and we reckon that’s deliberate. Check Microsoft’s own OneDrive plans comparison page before you commit, because the standalone storage tiers and the bundled subscription tiers aren’t priced the same way per gigabyte.
What this means if you’re gaming on Windows
This is where our beat intersects with everyone else’s spreadsheet-and-email version of OneDrive. If you’ve got Known Folder Move turned on and your Documents folder is where a chunk of PC games dump their save files, those saves are now syncing to the cloud every time you quit a session. Mostly that’s fine. Occasionally it’s the reason a save corrupts, because OneDrive tries to sync a file the game still has locked open, and the two processes fight over it.
We’d also gently push back on the idea that OneDrive syncing is a substitute for Steam Cloud or a platform’s own save sync, which is built specifically for that job and tested against it. Letting Windows’ general-purpose file sync handle your Documents folder while also trusting Steam Cloud to handle the same save file is a bit like having two separate controllers plugged into one player slot. Usually fine, occasionally a mess, and not something we’d recommend if you’ve got a genuinely long save you care about. If you’re deep into the Xbox app and Game Pass on PC ecosystem, Xbox has its own cloud save system that’s separate again from OneDrive, which adds a third layer of “where did my save actually go” confusion if something breaks.
Turning it off, or just taming it properly
You don’t have to use OneDrive at all. Right-click the OneDrive icon in your system tray, head into its settings, and you can unlink the account entirely, which stops the syncing and leaves your files sitting locally on your PC exactly where they were. Windows will grumble about it occasionally, but it’s not mandatory software in any meaningful sense, whatever the setup wizard implies.
If you’d rather keep it but stop the silent creep, go into OneDrive’s settings and turn off Known Folder Move for Desktop and Pictures specifically, keeping Documents synced if that’s genuinely useful to you. Check which folders are set to “Always keep on this device” versus online-only, because that single setting is responsible for most of the “where did my file go” panic we hear about. And if you’re the sort of household running one PC and three phones all signed into the same Microsoft account, check everyone’s photo backup settings individually, because that’s usually where the 5GB vanishes fastest.
What an actual backup plan looks like
Our honest take: treat OneDrive as a convenience layer for syncing files between your own devices, not as the thing standing between you and disaster. A proper backup strategy for anyone who cares about their files, gaming-related or otherwise, follows the old rule of three copies, two different types of storage, one of them offsite. That might mean OneDrive as your “offsite” copy alongside a local external drive doing the heavy lifting, rather than OneDrive doing both jobs at once.
This matters more than ever given how the ransomware landscape sits in Australia right now. The Australian Cyber Security Centre’s guidance on current threats consistently points to backups as the single most effective recovery tool against ransomware, and a sync folder that mirrors an encrypted file just as faithfully as a healthy one doesn’t count. If you haven’t sorted your password manager setup for 2026 yet, that’s a reasonable companion project to sorting your backups, since account compromise is usually step one in how people lose files in the first place.
Our verdict: useful, oversold, not a backup
OneDrive does what it says on the tin reasonably well. It’s convenient, it’s free up to a point, and the Microsoft 365 bundle is one of the rare subscription upsells we don’t mind recommending if you need Office anyway. Where we land mildly contrarian is this: we think Microsoft’s biggest misstep with OneDrive isn’t the price or the free tier size, it’s the deliberate softness around what “backed up to the cloud” actually means to someone who isn’t thinking about ransomware or accidental deletion at eleven at night.
Call it sync, badge it clearly, and let people decide separately whether they want backup on top of that. Right now it’s sold as one smooth-sounding bundle, and that fuzziness is exactly how people end up finding out what OneDrive isn’t, at the worst possible moment.
— Josh Tannenbaum, Gaming Writer, Tech Geek
