I currently have the personal icloud subscription of 50GB. How can I change to an already created family subscription (2TB), without losing photos/messages/notes and others? I fear I might lose this because there is not enough free space on my device to go back to the default icloud settings of 5GB.
When you change to a family subscription, your storage stays where it is under your Apple ID. The only thing that changes is the billing and the available space. To join a family subscription, see the "Switch from your personal iCloud+ plan to your family plan" section from Share iCloud+ with your family - Apple Support including the following:
If a family member is already paying for their own iCloud+ plan, they can choose to switch to your plan or keep their own and still remain part of the family. When they switch to the shared family plan, they get a refund for the remainder of their personal plan. They can't keep their current plan and use the shared family plan at the same time.
changing personal icloud subscription to a family subscription
