How to Back Up Important Files on Windows 10 and 11

Back up important files on Windows and the word people mean is usually a copy, which is a different thing. A copy says the file exists right now. A backup says you can get yesterday's version back after you overwrite it by accident. This guide works through the three layers that matter, the tools built into Windows, cloud copies that run while you sleep, and one copy stored elsewhere. It also covers the files people assume are covered and are not, plus the one test that proves a backup works.

A copy is not a backup, so know which one you have

Drag a folder onto an external drive and you have a copy. It is a good copy, and it protects you against the drive failing, but it does nothing about the everyday accidents. Delete the wrong photo, empty the recycle bin, install the wrong update and the copy carries the same damage.

A backup keeps a history. Windows calls those older copies versions, and a folder holding a week of versions lets you roll back a file that was edited, replaced or damaged. The second layer is distance: a copy on the drive inside the same case as the original survives neither a theft nor a fire.

If you are unsure whether the drive you depend on is healthy, read our guide to checking SSD and HDD health in Windows before you start copying anything.

Turn on File History for the folders you use

File History is the built-in versioning tool, and on Windows 11 you reach it through Control Panel rather than Settings. Press Win and R, type control.exe and press Enter, then choose File History from the Control Panel. The same page is also reachable from the taskbar by right clicking the File History icon in the notification area.

Pick a drive with Select drive, connect an external USB drive, and press Turn on. From then on, Windows saves versions of the files in your Documents, Pictures and Desktop folders to that drive on a schedule you can change under Advanced settings.

Because it keeps several versions rather than one, you can put an old file back. Right click any file in your Documents folder, choose Restore previous versions, and Windows lists every version File History has saved, with a preview you can open before you commit to it.

One catch catches people out. If the external drive does not appear in the list, the connection or the drive itself is usually the problem, and our guide to fixing a USB drive that is not showing up covers the checks worth making.

System images and restore points cover the machine itself

A system image is a full picture of your drive, and it is the layer that saves you after a drive dies or a Windows install goes wrong. In Control Panel choose Recovery and then Create a system image. Pick the external drive, choose whether to back up every file or only some, and let it run. Restoring means booting into the Windows recovery environment and pulling the image back onto a new drive, so the machine comes back exactly as it was.

Restore points are the lighter option. Open Control Panel, then System and Security, then System Protection, and tick System protection if it is off. From the same tab you can Create a restore point and change how much disk space Windows reserves for them. Restore points roll back system files and settings, not your documents, so they pair with File History rather than replacing it.

The old Windows 7 backup panel was removed in Windows 10. File History and system images replace it.

Layer two, keep a copy in the cloud

Cloud backup covers the case where the machine is stolen, lost or destroyed, because the files sit on Microsoft's servers rather than in your house. OneDrive is the sensible starting point because it already understands the Windows folder layout.

Open Settings, then Accounts, then OneDrive, then Manage backup and turn on Known Folder Backup for Desktop, Documents and Pictures. Your files move into a OneDrive folder and stay in place on the PC, and every change syncs. The catch is the internet connection: the first upload of a large photo library takes as long as it takes, and nothing is protected until it finishes.

Storage is the other catch. A free Microsoft account gives you 5 GB, which a single phone backup can fill, so a subscription is usually needed for real use. Google Drive works the same way for file types OneDrive handles less well, through the Drive for desktop app that mounts as a drive letter.

Layer three, one copy off the building

The third layer is the one people skip, and it is the layer that survives the worst day. A laptop that is stolen, a house that burns, a flood that takes the shelf with it. The standard rule is three copies of your data, on two kinds of media, with one copy offsite.

For most home users the three copies are: the files on the PC, the versions on the external drive, and the copy in OneDrive or Google Drive. Two media types means one is a drive and one is a service, not two drives in the same drawer. A password manager or a synced folder is enough for the offsite slot, and it costs a few pounds a month.

Before you copy gigabytes around, it is worth seeing what you are moving. Our guide to finding large files taking up disk space shows which folders deserve the space and which are just downloads you can delete.

What people actually lose

Most data loss is not a dead drive. It is a folder nobody thought to include, and these are the ones that come up repeatedly.

• The Downloads folder. File History does not cover it by default, so installers, receipts and anything you dragged there sit outside the backup. Add it to a library or copy it into your Documents folder.
• Outlook archives. Mailboxes live in PST files whose location you set under File, Account Settings, Data Files. They are often on a drive nobody thinks of as part of the backup.
• Browser bookmarks and saved passwords. Bookmarks export to an HTML file from the bookmark manager in Chrome, Firefox and Edge. Passwords are stored encrypted against your Windows account, so copy the file and it will not open. Export the list, or let the browser sync it.
• Game saves. They sit under Saved Games, under Documents in the My Games folder, or in the publisher's folder inside %LOCALAPPDATA%. Many titles sync through Steam or Xbox, and many older ones do not.
• Project files. The document you have been editing for three months usually lives on the Desktop or in a Documents subfolder, and it is the one file you cannot recreate.
• The OneDrive folder itself. Once Known Folder Backup has moved your documents into OneDrive, a deletion inside that folder syncs the deletion everywhere, including the cloud.

Set up a backup that will still work in a year

1. Get a drive at least twice the size of your data. Versioning needs room to keep older copies. A 1 TB drive for 400 GB of documents leaves plenty of headroom, and a 2 TB drive for a photo library is cheap insurance.
2. Use that drive for backups and nothing else. Storing your own working files on it means a stray delete, a full disk or ransomware can take out the backup along with the originals. Even better, unplug it between runs.
3. Set a schedule and let it run. File History saves automatically on a timer you choose, and the cloud copy runs continuously. The only thing that needs you is plugging the drive in.
4. Restore one file and open it. Open File History, choose your backup drive, find the file and restore it to a separate folder. If it opens and looks right, the backup works. If the restore fails, you have found out before it mattered.

The mistakes that quietly break backups

Three failures account for most of the broken backups I meet, and none of them announce themselves.

The first is backup software that writes to the drive it reads from. Point a sync or imaging tool at the same physical disk as the source and every new file overwrites the old backup, so a corrupted or encrypted source quietly replaces the clean copy with a broken one.

The second is a sync folder that contains itself. Put a synced OneDrive folder inside a folder that is also being synced, or back up the OneDrive folder into the OneDrive folder, and the tool copies the copy endlessly until the disk fills. Rename a backup folder so it can never sit inside its own source.

The third is never testing a restore. It is the most common and the most expensive, because an untested backup is an assumption. A restore takes five minutes on a file you do not care about, and it turns an assumption into a fact.

A fourth problem is an archive that will not open when you need it. If your plan involves zipping folders up, our guide to fixing Windows zip extraction errors covers recovering a damaged archive, though a zip next to the originals still protects you against nothing.

Frequently asked questions

What is the difference between a copy and a backup?

A copy is the same file in two places at one moment. A backup keeps older versions as well, so a file you overwrite by accident can be restored the way it was yesterday.

Does File History back up the Downloads folder?

Not by default. File History covers your Documents, Pictures and Desktop, and it reaches Downloads only after you add that folder to a library and include it.

How much space do I need for a OneDrive backup?

A free Microsoft account comes with 5 GB. A photo library fills that quickly, so Known Folder Backup usually ends up needing a Microsoft 365 subscription.

How do I check that a backup actually works?

Restore one file from the backup to a separate folder and open it. A backup that has never been restored from is only a hope, not a backup.

Is a zip file of my documents a backup?

No. A zip sitting in the same folder as the originals is another copy, and it dies with the drive. Keep one copy on other media and one copy offsite.

What to remember

• A copy is one moment, a backup keeps versions, and one copy has to be offsite.
• File History lives in Control Panel, not Settings, and covers Documents, Pictures and Desktop.
• A system image is your recovery plan for a dead drive, and restore points are for settings.
• OneDrive Known Folder Backup needs an internet connection and usually a subscription.
• Downloads, PST archives, bookmarks, passwords and game saves are the usual casualties.
• Restore one file and open it, because an untested backup is only a hope.

Plug in the external drive, switch File History on for your Documents, Pictures and Desktop, and then restore a single file to check it works. That hour of setup is the whole difference between losing a folder and losing an afternoon of work.