0x80070091
The directory is not empty
What it means
File History tried to restore or replace a folder and found files inside it that block the operation.
Common causes
- The target folder contains newer files
- A restore was interrupted halfway
- Permissions on the target folder
How to fix it
- Restore the files to a new folder instead of over the existing one.
- Create an empty folder and restore into it, then move the files you need.
- Check that your account owns the target folder and has Full control.
- Use Previous Versions from the folder's properties as an alternative.