Remove phone data from MIUI cloud without deleting account

Hello,

I bought a new phone (MI3), before I had a ZTE987. Both phones have MIUI installed, and backup data to the miui cloud, I see both phones in my MIUI account.

But now I want to delete the old phone from the cloud. How can I do that without deleting the data from my MI3 ? I can't find a "delete phone" button anywhere on i.xiaomi.com.

Thanks!