Hi @Domagoj Novak ,
What do you mean "create a OneDrive (SPO) user site"?
There are two primary advantages of moving or redirecting Windows known folders to Microsoft OneDrive for the users in your domain:
1.Your users can continue using the folders they're familiar with. They don't have to change their daily work habits to save files to OneDrive.
2.Saving files to OneDrive backs up your users' data in the cloud and gives them access to their files from any device.
For Reference: Redirect and move Windows known folders to OneDrive
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