Hi,
Before delete anything, backup all the sysvol files.
Then you can use the script to find the ‘Orphaned’ folders in the sysvol folder.
For the script and steps you can refer to the following link:
https://social.technet.microsoft.com/wiki/contents/articles/52209.active-directory-find-and-treat-orphaned-group-policy-objects.aspx
Best Regards,