When the processing of personal data is based on a contractual obligation or consent and is carried out in an automated manner, they may request data portability if this is technically feasible.

Example:

You want to change your bank because you are no longer satisfied with the services of your current bank.

You can ask the bank, as the controller, to transfer your data directly to the other bank, if it is technically feasible.

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Informant on “The rights of citizens as subjects of personal data”