I found your case (00932039): it was opened yesterday and support team is quite responsive.
Could you elaborate what is the backup mode you are using? In case of file level backup mode, please, share the screenshots of selected objects to backup? As I got from the case, the missing folder is called D:\Users - can you please compare the backup creation date and folder creation date just to be sure the folder in the question was not created after the backup was taken? Thank you.