Documents folder contains other important folders and isn't supported for file backup (OneDrive) - what kinds of important folders might those be?

[crackerbox_MS]

I have successfully backed up all my files except my "Documents" folder to OneDrive. The error message is:"Unable to sync", and a little lower:"Documents folder contains other important folders and isn't supported for file backup"I would have hoped that more information is conveyed with that error message, such as: What do I have to do prepare my documents folder such that a backup is possible? Has anyone learned which types of important folders are the ones that keep OneDrive from backing up the Documents folder? I'll be happy to try to remove them if that helps.Thanks!

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