This is mainly because Windows 11 has highersystem requirementsfor their gadget than Windows 10.
Besides, after years of development, Windows 10 now runs more stable than Windows 11.
According to Microsoft posts, your data will be safe throughout the upgrade.

However, Windows 10 users feedback shows that some users encountered data loss issues after upgrading to Windows 10.
I can’t find them anywhere.
Not even in the “Windows.old” folders.
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This is after the upgrade claimed that it would keep all files and software on the machine.
In addition to data loss,partitions might disappear after the Windows update.
However, in most cases, they were not permanently deleted but just moved to a different folder.

Encountering a black screen after Windows update?
This article will tell you why this issue occurs and how can you fix it.
MiniTool Power Data Recovery is such a reliable and green data restore tool worth trying.

Whats more, it is a read-only tool.
Launch MiniTool Power Data Recovery to get its main interface.
Under theLogical Drivessection, go for the drive containing lost data and clickScan.

Step 2: Preview/Filter/Find found files.
While scanning, you canpreview multiple types of the found files.
However, to get the best recovery result, you had better wait until the full scan finishes.

Step 3: Select and save the needed files.
I recommend you try it.Click to Tweet
Lost data after a Windows reinstallation?
Read this post to see how to recover files after reinstalling Windows 10/11.

Although the old account is still present, it is not set as the default account.
In this situation, you’re free to do these things to switch to the original account.
- In File Explorer, right-clickThis PCand chooseManage.
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- SelectLocal Users and Groupsfrom the left pane, and then double-click theUsersfolder.
If the user namedAdministratorhas a down arrow on its icon, its been disabled.
- To enable this account, double-click theAdministratoricon to openProperties.

Uncheck theAccount is disabledcheck box, and then selectApplyto switch on the account.
sign off and access to Windows 10 as Administrator account again.
Then you may be able to see your previous data or documents which were removed by Windows 10 upgrade.

Typeindexingin the search box on the taskbar, and then selectIndexing Options.
Step 2. pick the Advanced button to view more options.
SelectTroubleshoot search and indexing link.

Then you gotta wait for the process to complete.
Sometimes some files or folders may be hidden for their security.
And these files may not be searched for.

In the new window, selectShow hidden files, folders, and drivesand clickOK.
Then, you could try searching for your files again.
Do you know how to find scanned documents in Windows 11/10?
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If not, do not worry.
In this post, it’s possible for you to learn how to find and retrieve scanned documents.
Here I want to show you two excellent data backup tools to help you make file backups.

The first one is MiniTool ShadowMaker.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Major steps to back up your files:
Step 1.
Launch MiniTool ShadowMaker to get its main interface.

Move on to theBackuptab, and here you’re free to see theSOURCEsection and theDESTINATIONsection.
The system partitions are automatically selected in the SOURCE section.
Then click theDestination Folderto choose a safe location separate from the path where your source files are located.
Now you better wait for the backup process to finish.
The second one is MiniTool Partition Wizard.
Copy Disk copies all partitions as well as data from one disk to another within several steps.
you might download it and have a try.
Try These Top 4 Ways.
And, it’s advisable to back up data before upgrading your Windows system in case of any accidents.