ISO 27001 Data Retention Policy Explained + Template

In this guide, you will learn what an ISO 27001 Data Retention Policy is, how to write it yourself and I give you a template you can download and use right away.

ISO 27001 Data Retention Policy Explained

The ISO 27001 Data Retention Policy sets out how you long you keep different categories of data for. It is a legal and regulatory requirement.

It is one of the ISO 27001 policies required by the ISO 27001 standard for ISO 27001 certification.

ISO 27001 Data Retention Policy Template

The ISO 27001 Data Retention Policy Template is designed to fast track your implementation and give you an exclusive, industry best practice policy template that is pre written and ready to go. It is included in the ISO 27001 toolkit.

ISO 27001 Data Retention Policy Example

An example ISO 27001 Data Retention Policy:

How to write an ISO 27001 Data Retention Policy

Start by looking at what kind of data you have and how you store it. Then write down how long you need to keep it. Decide how you’ll securely delete or destroy data when the time is up. This could be by shredding paper or securely wiping a hard drive.

• Create your version control and document mark-up
• Write the ISO 27001 Data Retention Policy contents page
• Write the ISO 27001 Data Retention Policy purpose
• Write the ISO 27001 Data Retention Policy principle
• Write the ISO 27001 Data Retention Policy scope
• Define the approach to agreeing retention periods
• Explain the record of retention periods
• Set out what happens at the expiry of retention periods
• Explain the suspension of record disposal in the event of litigation or claims

What you need to know

Why You Need an ISO 27001 Data Retention Policy

You need a data retention policy for several important reasons. Firstly, it helps you reduce your risk. The more data you have, the bigger the target you are for cyberattacks. It’s like having fewer valuables in your house, so there’s less for a burglar to steal. Secondly, it helps you save money. Storing data costs money, and having less of it means lower costs. Lastly, it helps you stay compliant with laws like GDPR. Having a policy shows that you’re serious about protecting personal data and following the rules.

When You Need an ISO 27001 Data Retention Policy

You need a data retention policy as soon as you start handling any kind of data, especially if it’s personal information about people. If you’re a new business, you might think you can put this off, but it’s much easier to set up a policy from the beginning than to clean up a mess later. It’s a key part of getting your ISO 27001 certification.

Who Needs an ISO 27001 Data Retention Policy?

Everyone who handles data needs this policy! This includes all types of organisations, from a small bakery to a huge tech company. However, it’s particularly important for businesses that handle a lot of sensitive information, such as financial details, health records, or personal data.

Where You Need ISO 27001 Data Retention Policy

This policy applies to all the places where you store information. This means your computers, servers, cloud storage (like Google Drive or Dropbox), and even physical documents in a filing cabinet. The policy should cover all your data, no matter where it lives.

How to Implement it

Putting the policy into action is key.

Implementing a robust ISO 27001 Data Retention Policy ensures that your organisation mitigates the risks of data bloat and regulatory non-compliance. Follow these ten technical steps to establish a secure data lifecycle that satisfies Lead Auditors, aligns with the UK Data Protection Act, and protects your interested parties.

1. Categorise Information Assets via the Asset Register

• Provision a thorough review of your information assets to identify categories of personal, sensitive, and business-critical data.
• Result: A clear classification baseline that determines the appropriate retention level for every data set.

2. Identify Legal and Regulatory Mandates

• Formalise a list of statutory requirements, such as GDPR and the UK Data Protection Act 2018, that dictate minimum and maximum storage periods.
• Result: Legal alignment that prevents fines and ensures the organisation meets its “lawful basis” for processing.

3. Map Contractual Obligations for Interested Parties

• Identify specific retention clauses within client and vendor contracts to ensure business-specific requirements are met.
• Result: Contractual compliance that maintains stakeholder trust and prevents breach of service level agreements.

4. Formalise the Data Retention Schedule

• Document a centralised schedule listing each data category, the required retention duration, and the justification for the period.
• Result: A “single source of truth” document that provides definitive evidence for ISO 27001 auditors.

5. Provision Secure Storage and Encryption Controls

• Implement technical safeguards, such as AES-256 encryption at rest, for all data retained in archives or backups.
• Result: Technical assurance that data remains protected against unauthorised access throughout its entire lifecycle.

6. Assign IAM Roles and Disposal Responsibilities

• Define specific Identity and Access Management roles to ensure only authorised personnel have the permissions to delete or archive data.
• Result: Reduced risk of accidental or malicious data loss through granular technical accountability.

7. Integrate Automated Deletion Workflows

• Utilise technical scripts or cloud-native lifecycle management tools to trigger the automatic removal of data once thresholds are met.
• Result: Operational efficiency that removes the “human error” factor from the data disposal process.

8. Establish Secure Destruction Rules of Engagement

• Formalise Rules of Engagement for the physical and logical destruction of media, ensuring that data is rendered unrecoverable.
• Result: Verification that disposed data cannot be reconstructed by adversaries or unauthorised third parties.

9. Audit Disposal Evidence and Destruction Logs

• Collect system logs and certificates of destruction to maintain a definitive audit trail for every disposal action.
• Result: High-density evidence that proves the effectiveness of the policy during certification assessments.

10. Revoke Access and Update Policy Performance

• Conduct annual management reviews to update retention periods based on emerging threats, new laws, or changes in business strategy.
• Result: A dynamic, living policy that adapts to the evolving risk landscape of the organisation.

ISO 27001 Data Retention Policy Implementation Checklist

Step	Implementation Requirement	Audit Evidence / Example
1	Data Discovery & Inventory	A populated Asset Register identifying PII and business-critical data sets.
2	Legal & Regulatory Mapping	Documentation of statutory retention mandates (e.g. GDPR Article 5, UK Data Protection Act 2018).
3	Define Retention Thresholds	A defined schedule (e.g. HMRC records kept for 6 years plus current) linked to a “Lawful Basis”.
4	Create Data Retention Schedule	A version-controlled “Data Retention Schedule” approved by Top Management as documented information.
5	Technical Storage Controls	Evidence of AES-256 encryption at rest and IAM role-based access for archived data.
6	Automated Disposal Workflows	Configuration of cloud lifecycle policies (e.g. AWS S3 Lifecycle) or scripts for automated deletion.
7	Secure Destruction Protocols	Rules of Engagement (ROE) for cryptographic erasure or physical shredding of storage media.
8	Maintain Disposal Logs	A secure “Disposal Log” recording what was deleted, when, by whom, and the method used.
9	Staff Awareness Training	Training records showing that staff understand their disposal responsibilities under Annex A 6.3.
10	Management Review & Monitoring	Minutes from a Clause 9.3 Management Review evaluating policy effectiveness.

How to audit it

As an ISO 27001 Lead Auditor, I have conducted hundreds of assessments where the Data Retention Policy was the primary point of failure. Auditing this control is not about checking if a document exists, it is about verifying that your data lifecycle is technically enforced and legally defensible. Follow these ten audit steps to ensure your organisation meets the rigorous requirements of the ISO 27001: 2022 standard and global privacy mandates.

1. Inspect the Documented Data Retention Schedule

• Verify that a formal schedule exists and covers all information assets identified in your Asset Register.
• Result: Confirmation that the organisation has a defined baseline for storage limitation across all data categories.

2. Validate Legal and Regulatory Justification

• Cross-reference defined retention periods against statutory requirements like HMRC, GDPR, and the UK Data Protection Act 2025.
• Result: Assurance that retention thresholds are based on “Lawful Basis” rather than arbitrary internal preferences.

3. Sample Data Sets for Policy Alignment

• Select a random sample of database records or physical files to check if their age exceeds the defined retention limit.
• Result: Technical evidence that the policy is being operationalised rather than existing as “shelf-ware.”

4. Review Technical Disposal Workflows

• Audit the configuration of automated deletion scripts, cloud lifecycle policies, or manual disposal procedures.
• Result: Verification that the organisation has the technical capability to execute Annex A 8.10 requirements.

5. Examine Secure Destruction Evidence

• Inspect disposal logs and certificates of destruction to confirm that media has been rendered unrecoverable.
• Result: Proof that the organisation prevents data leakage during the final stage of the information lifecycle.

6. Audit Backup and Archive Retention

• Verify that retention rules are applied to backup snapshots and off-site archives, not just production environments.
• Result: Elimination of “shadow data” risks where legacy information persists indefinitely in secondary storage.

7. Confirm IAM Role-Based Accountability

• Review Identity and Access Management (IAM) permissions to ensure only authorised roles can modify or delete retained data.
• Result: Assurance that data integrity is maintained and that disposal actions are performed by accountable personnel.

8. Evaluate Rules of Engagement for Physical Data

• Audit the secure bins, shredding schedules, and physical transit logs for paper-based records and removable media.
• Result: Confirmation that the policy extends beyond digital assets to cover the entire physical threat landscape.

9. Interview Key Process Owners

• Question Data Custodians and IT leads on their understanding of the disposal process and their specific responsibilities.
• Result: Assessment of the “Human Element” and whether security awareness training has successfully embedded the policy.

10. Review Management Oversight and Policy Updates

• Examine Management Review minutes to ensure retention effectiveness is monitored and the policy is updated for freshness.
• Result: Evidence of “Continual Improvement” as required by ISO 27001 Clause 10.2 and Clause 9.3.

How it applies to Small Business, Tech Startups, and AI Companies

This policy is super important for different types of businesses, but for slightly different reasons.

Business Type	Why It Is Important	Practical Example
Small Businesses	Even a small customer list needs to be managed properly. A policy helps you protect your customers’ trust and avoid fines.	A local flower shop collects customer names and phone numbers for delivery. The policy says to delete this information 30 days after the delivery is complete, unless the customer signs up for a newsletter.
Tech Startups	You are probably moving fast and handling a lot of user data. A policy helps you manage this growth without letting data pile up and become a security risk.	A new social media app collects user profiles and messages. The policy states that user profiles are kept as long as the account is active, but messages are deleted after one year.
AI Companies	You deal with massive amounts of data to train your models. A data retention policy is crucial for managing this data, ensuring you are not keeping training data longer than you should and that you are complying with privacy laws.	An AI company uses photos to train a facial recognition model. The policy requires that all photos are deleted from the training servers three months after the model is trained and deployed.

ISO 27001 Data Retention Policy FAQ

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