Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsMake a separate, verified copy of your important files before upgrading Windows. For most home PCs, use Windows Backup to sync selected folders to a personal OneDrive account, File History to keep versions on an external or network drive, or both. A Recovery Drive can help reinstall Windows but contains no personal files, and Windows.old is only a temporary, scenario-dependent fallback.
The safest pre-upgrade plan
Microsoft’s guidance is explicit: “We recommend you back up your files before you install Windows 11.” Treat that as a prerequisite, not an optional precaution. An upgrade can preserve files when you choose the appropriate keep option, but a fresh installation from installation media can format the internal drive. A reset can also remove data.
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The reliable sequence is:
- Identify every folder and application data set you need after the upgrade.
- Choose a destination that is separate from the internal drive: a personal OneDrive account, an external USB drive, a network location, or a combination.
- Let the copy or synchronization finish.
- Open representative files at the destination and confirm the expected folders are present.
- Create a Recovery Drive separately if you want Windows recovery media.
- Only then start the upgrade, taking particular care if you are using installation media or a reset workflow.
Do not start the upgrade while a backup is still showing “syncing,” files are queued, or the external drive has not finished copying. A backup that has not been checked is only an assumption.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →What to save before upgrading Windows
Start with the standard personal folders
Windows Backup can sync selected Desktop, Documents, Pictures, Videos, and Music folders to OneDrive. These folders are a useful starting inventory, but they are not a guarantee that every important file is stored there. Look through each one and note files that must be available immediately after the upgrade.
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- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
- Work, school, tax, financial, legal, and medical documents.
- Photos, videos, audio projects, and other irreplaceable media.
- Files on the Desktop that were saved there temporarily.
- Project folders, archives, downloaded installers, and exported reports.
- Files shared from another user profile or stored on a second internal volume.
Search outside your user profile
Do not assume that the five common folders contain everything. Check other internal drives, custom folders such as C:Projects, and folders used by specialist applications. If an application stores its working data in a location you created yourself, add that location to the copy plan. Also record any file that exists only on a removable drive or network share so you can confirm it remains accessible.
Separate files from programs and settings
A folder backup is not an image of the computer. It does not reproduce every installed program, its activation state, or all of its settings. Make a list of programs you will need to reinstall and keep any installers, license information, or configuration exports that those programs provide. Windows Backup can include selected settings and some app information, but its folder option should be treated as personal-file protection rather than a complete system clone.
Compare the available backup methods
| Method | What it protects | Destination and requirements | Best use | Important limitation |
|---|---|---|---|---|
| Windows Backup with OneDrive | Selected Desktop, Documents, Pictures, Videos, and Music folders; selected settings and some app information | Personal Microsoft account and available OneDrive capacity. The free account allowance described by Microsoft is 5 GB. | Keeping selected files available in the cloud and restoring them on a replacement or upgraded PC | It syncs only the folders and items you select; it is not a full copy of every file and installed program. |
| File History | Changed versions of personal files | External drive or network location with enough free space | Browsing and restoring an earlier version of a document or other personal file | It protects files included in its configured libraries and depends on the destination remaining available. |
| Manual copy to external storage | Any folders and files you deliberately select | External USB drive or SSD with sufficient capacity and a compatible connection | Making a straightforward, separate copy before a high-risk upgrade | It does not automatically keep historical versions unless you create them yourself. |
| Recovery Drive | Windows recovery files, including system files and manufacturer customizations | Empty USB drive; the drive used to create it is erased | Repairing or reinstalling Windows when the system cannot start normally | It contains no personal files and must not replace a file backup. |
| Windows.old | Potentially recoverable files from a particular upgrade scenario | Created on the internal drive during some upgrade paths | Short-term retrieval when the documented keep option and installation path apply | It is temporary, can be removed, and does not protect against a formatted drive or failed disk. |
Choose based on the restore problem you are trying to solve. Cloud synchronization is convenient when you have a personal account and adequate internet access. File History is better when you need previous versions. A manual external copy provides physical separation from the internal disk. A Recovery Drive addresses Windows startup and reinstall problems, not missing documents.
Use Windows Backup and OneDrive
Check account and storage eligibility first
The Windows Backup app described by Microsoft is intended for consumer devices using a personal Microsoft account. A work or school account does not work with that app as described. Sign in with the personal account that should own the backup and check its remaining OneDrive capacity. Microsoft states that a free Microsoft account includes 5 GB of OneDrive storage, with additional storage available for purchase. If the selected folders contain more data than the remaining space, synchronization cannot provide complete coverage.
Select only the folders you intend to protect
Open Windows Backup from Start and review the folder selections before enabling the backup. Confirm whether Desktop, Documents, Pictures, Videos, and Music are each selected. If a folder is not selected, its contents are not covered by this method. Add a separate copy plan for files stored elsewhere.
Wait for synchronization to finish
Leave the PC connected to power and the internet while the files upload. Large photos and videos can take longer than small documents. Do not interpret the appearance of a folder as proof that every item has finished syncing; inspect the sync status and wait for pending items to clear.
Verify from the destination
Open OneDrive on the PC and, where available, sign in to the same account from another browser or device. Check that the expected top-level folders and several representative files are visible. Open at least one document and one media file from the destination. If a file is online-only, make sure it can be downloaded before beginning an upgrade that might interrupt access.
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- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Understand what you will restore
After an upgrade, OneDrive can make the synchronized folders available again, but it will not reinstall every desktop program. Keep your application list and any program-specific exports separately. If the PC is managed by an organization, its account and policy may limit Windows Backup; ask the administrator before relying on it.
Use File History for versioned local backups
Prepare an external or network destination
File History periodically scans personal files and saves changed copies to an external drive or network location. Connect a drive that is separate from the internal Windows disk, or confirm that the network destination is reachable. Capacity is not fixed: it must be large enough for the folders you include and the number of historical versions you want to retain.
Turn on File History
Search Start for File History and open its settings. Choose the available external drive or network location, then turn File History on. Review which personal folders are included and allow an initial scan to complete. Keep the destination connected or reachable long enough for the first run to finish.
Confirm that versions exist
Use the File History interface to browse a folder and look for earlier versions of a file. Restore a non-critical test file to a temporary location so you know the destination and permissions work. This check is especially useful when the backup is on a network path that may require credentials.
Keep the drive separate during the upgrade
When the first backup is complete, safely disconnect the external drive and store it away from the PC while the upgrade runs. Physical separation protects the copy if the internal disk is formatted or the computer experiences a hardware failure. Reconnect it only when you need to restore files or create another version.
Make a manual copy to an external drive
A manual copy is a practical fallback when you do not want to use cloud storage or need an additional independent copy. Microsoft identifies an external USB drive as a place to back up files before upgrading. The drive is optional, not a mandatory purchase; use storage you already have if it has enough free space and a compatible connection.
- Check the size of the folders you plan to copy and compare it with the drive’s free space.
- Connect the external drive and create a clearly named folder such as
Before-Windows-Upgrade. - Copy the selected folders, preserving their internal structure. Do not move the originals; copy them.
- Wait until Windows reports that the copy is complete. If an item is skipped because it is open or inaccessible, note it and copy it after closing the relevant application.
- Open several copied files directly from the external drive. Check different file types and at least one file from each critical folder.
- Safely eject the drive and keep it disconnected while the upgrade is performed.
Do not infer performance, capacity, or compatibility from the words “USB drive” alone. Check the exact drive and the PC’s available connection. The important properties for this task are sufficient capacity, reliable access, and separation from the internal disk.
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- Easily store and access 1TB to content on the go with the Seagate Portable Drive, a USB external hard drive.Specific uses: Personal
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop. Reformatting may be required for Mac
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Create a Recovery Drive only for Windows recovery
A Recovery Drive has a different job from a personal-file backup. Microsoft says it can include Windows system files and manufacturer customizations so you can reinstall or recover Windows, but it does not include personal files.
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- Search Start for Recovery Drive and open the Windows tool.
- Follow the wizard to create the recovery media, understanding that the USB drive used in the process is erased.
- Label the completed drive and store it separately from the PC.
Create the Recovery Drive after you have secured personal files, or use a different USB drive from the one holding your manual copy. A Recovery Drive cannot restore a missing Documents folder, photo library, or project archive; use Windows Backup, File History, or a separate copy for those items.
Why Windows.old is not your backup
In the upgrade scenario documented by Microsoft, choosing Nothing in the keep-options can leave personal files temporarily in a Windows.old folder. The stated retrieval period for that scenario is 10 days. That folder is on the same internal drive as Windows, so it is not independent protection against drive failure, accidental deletion, or formatting.
The fallback does not apply when installation media is used to install a fresh copy, and it does not protect files removed by Reset this PC. A fresh installation can format the drive and erase its contents. Treat Windows.old as a possible short-term recovery route after a qualifying upgrade, never as the plan you make before upgrading.
Follow this pre-upgrade checklist
- Inventory: list the folders that matter, including locations outside Desktop, Documents, Pictures, Videos, and Music.
- Choose destinations: decide whether you need OneDrive, File History, a manual external copy, or two methods for extra separation.
- Check prerequisites: confirm personal-account eligibility and OneDrive space, or verify that the external or network destination has enough capacity.
- Run the backup: wait for synchronization, File History’s initial scan, or the manual copy to finish.
- Verify contents: inspect the destination and open representative files, rather than relying on a completion notification alone.
- Disconnect local media: safely eject an external backup drive and keep it away from the PC during the upgrade.
- Create recovery media: if needed, make a Recovery Drive on an empty USB drive and keep it separate from personal-file media.
- Review the installer choice: confirm whether the upgrade will keep files. Stop and make another copy before selecting a fresh-install or reset option.
Verify that the backup is actually usable
Check the destination, not just the source
A source folder can look complete even when the destination is missing items. Browse the OneDrive folders, File History timeline, or external-drive copy itself. Compare folder names and approximate item counts for the most important locations.
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Open representative files
Test more than one format: a document, a spreadsheet or PDF, a photo, and a video if those formats matter to you. Opening files confirms that they are readable and that the destination is not merely a list of placeholders.
Confirm account access and credentials
For OneDrive, verify that you can sign in to the personal Microsoft account that owns the synchronized files. For a network destination, confirm that you still have the required permissions. For an external drive, safely eject it and reconnect it once to make sure Windows can read it.
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- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Record what is intentionally excluded
Write down folders that were too large for the available OneDrive space, files that an application kept open, and data stored on another device. An explicit exclusion is safer than forgetting that the file was never copied.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes and how to correct them
Relying on a work or school account in Windows Backup
Symptom: the Windows Backup experience described by Microsoft will not set up as expected with an organization account.
Correction: use an eligible personal Microsoft account for that feature, or choose File History or a separate external copy. On a managed PC, ask IT which backup method the organization supports.
Running out of OneDrive space
Symptom: some folders or files remain unsynchronized.
Correction: review the selected folders and remaining storage before the upgrade. Remove unnecessary files from the sync set only if you have copied them elsewhere, or use a local destination with enough capacity.
Backing up only the obvious folders
Symptom: the backup appears successful, but a project or archive is missing after the upgrade.
Correction: inspect other internal volumes and custom application folders, then add them to a manual copy or another supported backup set.
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Confusing a Recovery Drive with a file backup
Symptom: Windows can be reinstalled from the USB drive, but personal documents are not there.
Correction: create a separate personal-file backup. Use an empty USB drive for the Recovery Drive because its contents are erased during creation.
Leaving the only backup connected
Symptom: an installation problem affects both the internal disk and the attached external copy.
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Correction: after verifying the copy, eject and physically separate the external drive until the upgrade is complete.
Starting a fresh installation without checking the disk
Symptom: the installation process offers a clean setup and the existing files disappear.
Correction: stop before formatting or deleting partitions, confirm the backup opens successfully, and proceed only when you understand that a fresh install can erase the drive.
Which method should you choose?
Choose Windows Backup with OneDrive when
- You use a personal Microsoft account and have enough remaining OneDrive space.
- You want selected folders available from another device after the upgrade.
- You can leave the PC online long enough for synchronization to finish.
Choose File History when
- You need earlier versions of files, not just the newest copy.
- You have an external drive or network location with enough capacity.
- You prefer a local or network destination and can keep it reachable for scheduled scans.
Choose a manual external copy when
- You want a simple, physically separate copy before a high-risk installation.
- You do not have suitable cloud storage or prefer not to depend on internet access.
- You need to include custom folders that are not covered by the selected Windows Backup folders.
Use two methods when the files are irreplaceable
For critical records, combine a cloud copy with a disconnected external copy, or combine File History with a manually verified copy. The methods protect against different failure modes: cloud access helps when the PC or its disk is unavailable, while a disconnected local drive remains available when internet access or account access is a problem.
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What to do after the upgrade
Sign in to the same personal Microsoft account if you used OneDrive and check that synchronization resumes. Reconnect the File History or manual-copy drive only when you are ready to restore files. Reinstall required applications from trusted installers and restore their data from the locations you verified before the upgrade.
If files are missing, do not immediately delete old folders or reformat the disk. First check the OneDrive destination, the File History versions, and the external copy. If your upgrade path qualifies, inspect Windows.old promptly because Microsoft’s documented retrieval window for that scenario is limited to 10 days.
Bottom line
Back up first, verify the copy, and keep it separate from the PC. Windows Backup and OneDrive cover selected folders for eligible personal accounts; File History preserves versions on external or network storage; a manual external copy adds straightforward physical separation; and a Recovery Drive only prepares Windows recovery. Never rely on Windows.old, a keep-files option, or an unverified sync as your only protection before upgrading.
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