What is a prerequisite for files to be encrypted at rest?

Files need to be in .hyper format to be eligible for encryption at rest. This requirement arises because Tableau transitioned to the .hyper format to improve data handling and security features, including the capability to encrypt data files when they are stored on disk. The .hyper format supports efficient data storage and retrieval while also allowing the application of encryption protocols to protect sensitive data.

The upgrade to .hyper format is crucial because prior formats, such as .tde, do not support the same level of encryption capabilities that .hyper files do. Therefore, only files in the .hyper format can take advantage of the encryption at rest feature, ensuring that data is protected when it is not actively in use or being transmitted.