What effect does enabling encryption at rest have on restoration time?

Enabling encryption at rest in a data storage environment requires the use of encryption keys to secure data stored on disk. When data needs to be restored, the system must first decrypt the data, which involves fetching and using the appropriate encryption keys to perform this task. This additional step of key exchange and decryption can introduce latency in the restoration process.

As a result, the overall time required to restore data may increase because of these additional operations needed to access the encrypted data. Therefore, the correct answer highlights the increased restoration time as a direct consequence of needing to handle the encryption and key management processes during data recovery.