Data processing apparatus, access control method, and storage medium to implement backup on a removable medium

摘要

When an accessible state of an external memory means is instructed to be canceled and data is not being stored in the external memory unit, a data processing apparatus cancels an accessible state of the external memory unit if the external memory unit is not set as a backup destination, and does not cancel the accessible state of the external memory unit if the external memory unit is set as the backup destination.