31.2 The system shall protect entered data so as to prevent it from being obscured by new data, keeping both the old and current data available for review.
31.4 The system shall have a mechanism to securely retain data in the system for a specific time period and enable protections that ensure the accurate and ready retrieval of that data throughout the records retention period.
31.8 The system shall be capable of identifying instances of audit processing failure (e.g., write errors, general failure of the audit tool, etc.), sending alerts or notifications to appropriate personnel in such cases.