In today's rapidly accelerating digital transformation, data is the most valuable asset an organization possesses. Data loss due to hardware failures, user errors, ransomware attacks, or natural disasters can cause irreparable operational and financial damage to companies. The ISO 27001 standard, which is the Information Security Management System (ISMS) standard, mandates the creation of comprehensive and applicable data backup policies to ensure the integrity, confidentiality, and availability of corporate data.
In this guide, we will discuss how to design a backup policy fully compliant with ISO 27001 standards, technical requirements, and critical success factors in disaster recovery processes.
Why is Backup Mandatory Under ISO 27001?
The ISO 27001 standard does not view information security as merely consisting of penetration tests or firewall rules. Ensuring that information is "accessible" under all conditions is one of the three main pillars of the standard (Confidentiality, Integrity, Availability).
The "Backup" clause, which is among the updated Annex A controls of the standard, explicitly requests organizations to take backup copies, ensure the security of these copies, and test them regularly to protect information assets and systems. This requirement is the most fundamental guarantee of protecting business continuity in both planned maintenance outages and unexpected disaster scenarios.
Fundamental Components of an ISO 27001 Compliant Backup Policy
Simply installing backup software and taking daily backups is not enough to pass ISO 27001 audits and build real cyber resilience. A written backup policy compliant with standards must include the following critical elements:
1. Backup Frequency and Scope
How often which data will be backed up should be determined according to the criticality of the data.
- Critical Databases: Hourly or real-time replication.
- User Files and Shared Areas: Daily incremental backup.
- System Images and Configurations: Weekly or monthly full backup.
2. Retention Policy
How long the backed-up data will be stored must be clarified in the policy in line with legal regulations (such as KVKK, Law No. 5651, or sectoral regulations) and business needs. For example, while financial data may need to be stored for 5 or 10 years, a retention period of a few months may be sufficient for temporary log data.
3. Storage Location and Security
Where backups are stored determines their resilience against physical and cyber threats. ISO 27001 requires backup copies to be stored in a different physical location from the environment where the primary data is located. In addition, access permissions to backup servers should be strictly restricted, and backup data must always be stored encrypted.
4. The 3-2-1 Backup Rule
The golden rule of backup, which is internationally accepted and frequently sought by ISO 27001 auditors, is as follows:
- 3 different copies: There should be at least 3 copies of the data, excluding the original.
- 2 different media types: Backups should be kept on at least two different storage units such as NAS devices, external disks, tape cartridges (LTO), or the cloud.
- 1 offsite location: At least one copy of the backups should be stored outside the main office or data center (in a different city or in a cloud environment).
Determining RTO and RPO Values
The most technical and business-oriented part of the backup policy is the RTO and RPO targets determined based on business continuity analyses:
- RPO (Recovery Point Objective): The maximum acceptable data loss period in the event of an outage. For example, in a system where the RPO value is determined as 4 hours, at most the last 4 hours of data can be lost. This requires the backup frequency to be at least once every 4 hours.
- RTO (Recovery Time Objective): The target time for systems to be restored to working order after an outage. For example, a critical ERP system with an RTO target of 2 hours must be made available for use within 2 hours of the failure at the latest.
| Target | Definition | Criticality Level | Example Solution |
|---|---|---|---|
| Low RPO | Minimum data loss target. | Very High (Finance/E-commerce) | Real-time Replication / CDP |
| Low RTO | Minimum downtime target. | Very High (Production/Service) | High Availability / Failover Cluster |
| High RPO/RTO | Longer tolerable periods. | Low (Archive/Historical Data) | Daily/Weekly Cold Backup |
Backup and Disaster Recovery for Companies in Ankara
Especially for public institutions, defense industry suppliers, and financial organizations operating in Ankara, data security and backup processes are subject to much stricter audits. Since public regulations and ISO 27001 standards may restrict data from being taken abroad, backup solutions must be configured in local data centers or secure on-premise infrastructures.
At LeonX, we analyze these special needs of businesses in Ankara and design backup architectures that are fully compliant with regulations, encrypted, and isolated against cyber attacks.
The Importance of Professional Backup Management
Designing an ISO 27001 compliant backup infrastructure, writing its policies, and constantly auditing it requires serious expertise. You can review our Managed Services solutions to raise your organization's business continuity standards and build a proactive data protection model.
During the stage of designing and documenting your backup architecture in accordance with standards, you can benefit from our Backup Strategy Design and Policy Management services provided by our expert team.
Additionally, you can review our ISO 27001 Risk Assessment guide for risk analyses that need to be done before creating your backup policy, and browse our articles ISO 27001 and Network Security and What is ISO 27001? to learn about other technical stages of the certification process.
To establish a backup and disaster recovery infrastructure that is customized for your organization, reinforced with world-class technologies like Veeam Backup, and will receive full marks from audits, please contact us.
Frequently Asked Questions
Is only taking backups sufficient for ISO 27001 compliance?
Absolutely not. The ISO 27001 standard mandates that the accuracy and recoverability of the backups taken must be tested regularly. "Restore Test" drills must be performed at least once or twice a year, and these drills must be reported and recorded.
What should be done to protect backup servers from cyber attacks?
Cyber attackers target backup servers first, especially in ransomware attacks. In order to prevent backups from being encrypted as well, it is mandatory to isolate the backup network from the main network (Network Segmentation), store backups with immutable technologies (Immutable Backup), and activate MFA usage on backup servers.
Does cloud backup cause problems in terms of ISO 27001 and KVKK?
Cloud backup offers an excellent "offsite location" solution for ISO 27001. However, due to KVKK regulations in Turkey, storing backups containing personal data in foreign-hosted cloud services (AWS, Azure, etc.) may require explicit consent or board approval. Therefore, choosing local cloud backup solutions hosted in local data centers is much safer for legal compliance.
Conclusion
The backup policy is the most vital lifeline of the ISO 27001 Information Security Management System. A correctly configured, encrypted, isolated, and regularly tested backup infrastructure not only successfully passes audits but also guarantees the future of your business by enabling you to get back on your feet within minutes even in the most devastating cyber attacks.
