Hello What are my choices to set a ntfs permission to a folder, make it accessable to a single admin (user)? Apparentely, another admin can take ownership of it and although the ntfs permissions aren't readable, or they do become readable? Another suggestions ?
Administraotrs will always have ability to change permissions, that's why it's called an Administrator account Drop other Admins to users or save your files on external storage > remove storage when not at the machine Encryption might be an option
An admin user will always be able to take ownership and change permissions, or bypass ACL entirely (using backup/restore privilege). No point trying to protect against that with ACLs.