How to Upgrade Windows 10 to 11 Without Losing Your Files

Upgrading from Windows 10 to Windows 11 keeps your files, programs, and settings in place, if you do it in the right order. Here's the whole process, step by step, with the one precaution that saves people the most grief.

Step 1: Back up your files first

Do this before anything else. An in-place upgrade almost never loses data, but "almost never" is doing a lot of work in that sentence. If your hard drive is already tired, the extra load of an upgrade is exactly the kind of thing that pushes it over.

Copy your photos, documents, and anything you'd hate to lose to an external drive or a cloud service. Don't rely on the drive being upgraded to hold the only copy.

Step 2: Check that your PC qualifies

Not every Windows 10 machine can run Windows 11. Microsoft raised the bar. The main requirements are:

The easy way to check is Microsoft's own PC Health Check app. Download it, run it, and it tells you pass or fail, and usually which requirement failed.

If it says you're fine, skip to step 4. If it says you're not, read the next step before you give up, because the fix is often simpler than it sounds.

Step 3: If it says "This PC can't run Windows 11"

This message scares people off, and it shouldn't always. TPM 2.0 and Secure Boot are built into most computers from the last several years, they're just turned off by default in the BIOS. Flip them on and the same "unsupported" PC becomes eligible.

The problem is that the BIOS is not a friendly place to poke around. The setting names differ by manufacturer (TPM might be called "PTT" on Intel or "fTPM" on AMD), and changing the wrong thing can leave a machine that won't boot. If you're comfortable in the BIOS, look for those settings and enable them, then re-run PC Health Check.

If the message is about your processor, that's a harder wall. An unsupported CPU isn't something you flip on. At that point the real question is whether to upgrade the hardware or replace the machine, and we cover that call in the Calgary upgrade guide.

Step 4: Free up space and plug in

The upgrade needs room to work. Make sure you've got at least 20 GB of free space on your system drive, and more is better. If you're tight, clear out downloads and empty the recycle bin.

If it's a laptop, plug it in. An upgrade that runs out of battery halfway through is one of the few ways to genuinely break an install.

Step 5: Run the upgrade

Once you qualify, the upgrade itself is mostly waiting. Two ways to start it:

1. Windows Update. Open Settings, go to Update & Security, and check for updates. If Windows 11 is offered to your machine, you'll see a "Download and install" option. This is the simplest path.
2. Installation Assistant. If Windows Update hasn't offered it yet, download Microsoft's Windows 11 Installation Assistant, run it, and it walks you through the same upgrade directly.

Either way, pick the option that keeps your files and apps when it's offered. The machine will download, restart a few times, and land you on the Windows 11 desktop with everything where you left it. On an SSD this takes under an hour. On an old mechanical drive it can take a few hours, so start it when you don't need the computer.

Step 6: Check your drivers afterward

After the upgrade, run Windows Update again. It'll pull down updated drivers for most of your hardware. This is where the odd post-upgrade problem lives, Wi-Fi that won't connect, no sound, a printer that's gone missing, and it's almost always a driver that needs updating rather than anything actually broken.

If something's off, the usual fix is finding the current driver from the manufacturer's website. We wrote up the common ones in Windows 11 upgrade problems and how to fix them.

If you don't like it, you can go back

Windows keeps your old Windows 10 setup for ten days after upgrading. If something's wrong or you just prefer the old layout, Settings has a "Go back" option that returns you to Windows 10 with your files intact. After ten days it deletes the old files to reclaim the space, so decide within that window.

When to hand it off

Most upgrades are boring, in the good way. Hand it off when they're not: the BIOS changes make you nervous, the machine has data on it you can't afford to lose, or you've hit a wall you can't get past. Businesses with several machines and a network to keep running are usually better off having it planned rather than doing them one at a time and hoping.

See laptop and computer repair for what that covers.