When Windows backup is turned on, Windows backs up the settings you choose across all your Windows 10 and Windows 11 devices that you've signed in to with your Microsoft account.
You can back up preferences including passwords, language, and other Windows settings. If you turn on Other Windows settings, Windows also syncs some device settings (for things like printers and mouse options), File Explorer settings, and notification preferences.
See also:
About Windows backup and sync settings - Microsoft Support
Windows backup and sync settings sync the settings you choose across all your Windows devices that you've signed in to with your Microsoft account.

Starting with Windows 11 build 25179, the spelling dictionary will now use a language-neutral word list and Microsoft is trying out syncing this across all devices that use the same Windows account via the Language preferences setting.
Starting with Windows 11 build 25231, the spelling dictionary now uses a language-neutral word list and syncs across all devices that use the same Windows account
This tutorial will show you how to turn on or off Remember my preferences for your Microsoft account across all your Windows 11 devices you sign in with the same Microsoft account.
To stop backing up your settings and remove them from the cloud, turn off Windows backup settings on all the devices connected to your Microsoft account. Once this is done, you'll need to remove these settings from your account. Here's how:
1) Go to account.microsoft.com/devices
2) At the bottom of the page, click/tap on the Clear stored settings link under Cloud synced settings.
EXAMPLE: Select to restore from device during clean install with Microsoft account
Here's How:
1 Open Settings (Win+I).
2 Click/tap on Accounts on the left side, and click/tap on Windows backup on the right side. (see screenshot below)
Open Backup Settings
3 Do step 4 (on) or step 5 (off) below for what you want.
4 Turn On "Remember my preferences"
This is the default setting.
A) Turn on Remember my preferences. (see screenshot below)
B) Click/tap on Remember my preferences to expand it open.
C) Check (default) or uncheck Accessibility.
D) Check (default) or uncheck Passwords.
E) Check (default) or uncheck Language preferences.
F) Check (default) or uncheck Other Windows settings.
G) Go to step 6.
5 Turn Off "Remember my preferences"
A) Turn off Remember my preferences, and go to step 6. (see screenshot below)
6 You can now close Settings if you like.
That's it,
Shawn Brink
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