Preparing for a GDPR Audit: What You Need to Know

Preparing for a GDPR audit can raise concerns—do we know exactly where all personal data is processed? Is every action documented? Do we have up-to-date consents?
To reduce uncertainty, it’s essential to perform a full inventory of data and processing activities. This involves collecting information about all systems, processes, and assets related to personal data within the company. The result is a comprehensive data map—showing what happens, where, and for what purpose—which is crucial for demonstrating compliance with GDPR.

At the same time, organizations should verify formal aspects: the accuracy and completeness of documentation (e.g., policies, data processing agreements), the legal basis for processing, and the validity of obtained consents. Preparing for a personal data audit is not just a checklist exercise—it’s a key step toward full GDPR compliance and improved data security.

Key GDPR Responsibilities to Keep in Mind

Before an audit, it’s worth reviewing the main responsibilities of a data controller. These include:

• Identification of personal data – A detailed inventory of all systems, processes, and storage locations where personal data is held. This includes IT systems, databases, documents, and storage media containing employee or customer data. A comprehensive overview is the foundation for proving GDPR compliance.
• Data minimization and purpose limitation – According to Article 5 of the GDPR, personal data must be adequate, relevant, and limited to what is necessary for specific purposes. Organizations must collect only the data needed for clearly defined business goals and avoid using it for unrelated purposes.
• Data retention – The GDPR requires that data not be kept longer than necessary. The controller must define data retention periods and regularly review stored data. Once the processing purpose is fulfilled, the data should be deleted or anonymized without delay. These periods should also be recorded in the data processing register (Article 30).
• Right to be forgotten – Article 17 gives individuals the right to request deletion of their data. The controller must erase the data “without undue delay” when it’s no longer needed or when consent is withdrawn. Organizations must implement procedures to fulfill such requests, including removing data from all systems and notifying third parties if needed.
• Accountability and documentation – GDPR introduces the principle of accountability. Data controllers must demonstrate compliance with all data protection principles (lawfulness, fairness, transparency, etc.). This requires proper documentation: a processing register (Article 30), data protection policies, security procedures, incident records, and more. For example, Article 30 requires that categories of data, processing purposes, and planned deletion dates be properly documented. Good records make it easier to demonstrate compliance during audits.

How Wizards Products Support GDPR Compliance

Preparing for a GDPR audit can be faster and more effective with the right tools. Wizards products address key data protection needs:

• Detecto – Scans systems and databases for personal data. Detects tables and fields with sensitive content and identifies changes in database structure. This helps with complete data asset inventories and supports anonymization and retention processes by keeping personal data under continuous review.
• Revelio – Searches for personal data in dispersed documents. It scans shared folders, employee devices, and email inboxes to locate documents containing sensitive data. This allows organizations to pinpoint where personal data resides—supporting audits and digitization efforts.
• Nocturno – An advanced anonymization tool for test and development environments. It uses an extensive set of dictionaries and generators to anonymize data across multiple systems while maintaining consistency and original data formats (e.g., date formats, checksums). It replaces personal data with realistic fictitious values without breaking testing workflows.
• Oblivio – A data retention and compliance management system. It acts as an internal platform covering all systems that process personal data. Oblivio monitors retention periods based on predefined rules and detects when the legal basis for processing expires. Once the retention period ends, it automatically launches anonymization workflows and generates audit-ready reports of data retention and deletion.

Checklist: Are You Ready for a GDPR Audit?

Before the audit, verify whether your company meets the key data protection requirements:

• Have you inventoried all personal data sets and processing activities in your organization?
• Do you maintain an up-to-date record of processing activities (ROPA) in accordance with Article 30?
• Are written policies, procedures, and data protection instructions in place and implemented (for processing, security, incident handling, etc.)?
• Are the legal bases for data processing (contracts, consents, authorizations, DPO decisions, risk assessments/DPIAs) current and documented?
• Have you defined retention periods for various categories of personal data and implemented mechanisms to delete or anonymize data once those periods expire?
• Have employees completed mandatory data protection training, and has a Data Protection Officer (DPO) or responsible person been appointed?

Regularly reviewing these points will help structure your audit preparation and reduce the risk of non-compliance.

Ensure GDPR Compliance with Wizards

Preparing for a GDPR audit is not something you should approach blindly. Rely on the expertise of our team and our modern compliance tools.
Book a meeting with the Wizards compliance team to discuss your organization’s needs. During the session, we’ll show how our products—Detecto, Revelio, Nocturno, and Oblivio—can streamline your data inventory, automate retention and anonymization processes, and help you prepare confidently for audits. Ensure full GDPR compliance and peace of mind—contact Wizards today.