Northern Trail Outfitters (NTO) stores most of their customer data in Marketing Cloud.

Transparent Data Encryption (TDE) is the appropriate method for ensuring that the underlying database files are encrypted at rest. TDE encrypts the database files themselves, protecting the data in case the physical media is stolen, while allowing the data to be viewed in clear text by authorized users within the system.

Transparent Data Encryption: Encrypts data at rest, ensuring that the database files are secure.