Hi, @rkobriger Are you making use of the ‘files on demand?’
This is a new (revived, old) feature where the files/folders on disk are actually not locally present but are an exotic filesystem object called an NTFS Reparse point. When the OS encounters request to open the file, it’s supposed to sync it automatically from the OneDrive service.
However, I think there can sometimes be issues. These have caused (different) issues w/ duplicati in the past:
-The recommendation there (Comment #6) re symlink policy may still be valid-
EDIT: oops: I didn’t notice that part of your post.