How Australian Businesses Can Prepare for a Data Breach
Synopsis
Learn how Australian businesses can prepare for a data breach, meet Privacy Act obligations, strengthen cybersecurity, develop an effective response plan and comply with the Notifiable Data Breaches scheme.
A data breach can have a devastating effect in just hours, yet it can be felt for a long, long time. In addition to the cost of the investigation itself, businesses can also be subject to regulatory review, legal fees, downtime and loss of customer trust.
Australia's businesses can no longer get away with preparing their systems as an IT activity, it has become a leadership and governance issue involving all employees and third-party suppliers.
The Office of the Australian Information Commissioner (OAIC) has consistently received hundreds of data breaches every six months, most of which are caused by malicious or criminal activity. Human error and system failures are also important causes, and there are many incidents that are preventable by improving the internal controls, not by spending a lot of money on technology.
The first step to preparing for a data breach in Australia is to be aware of your legal responsibilities and to implement practical processes to prepare for a data breach before it happens.
Understand your obligations under Australian privacy law
The privacy framework in Australia is mainly governed by the Notifiable Data Breaches (NDB) scheme, which is managed by the Office of the Australian Information Commissioner (OAIC), and the Privacy Act 1988 (Cth).
The Privacy Act applies to Australian Government agencies, and to private sector organisations with an annual turnover of more than AU$3 million. But for certain organisations, irrespective of turnover, the following apply:
- Private health service providers
- Credit reporting bodies
- Companies dealing in personal data
- Tax file number recipients
- Some Commonwealth contractors
The Australian Privacy Principles (APPs) provide guidelines for collecting, storing, securing and destroying personal information that business covered by the Act must adhere to.
The OAIC's Data Breach Preparation and Response Guide states that organisations have procedures established to address privacy breaches, which include a plan for identifying, assessing and responding to privacy incidents in advance.
What is considered an eligible data breach?
All cyber incidents are not reportable.
An organisation is required to notify under the Notifiable Data Breaches scheme Australia where it:
- Personal information is missing, accessed or disclosed without permission.
- The breach will likely cause harm to one or more people.
- The organisation has not been able to prevent that harm through remedial action.
The OAIC recommends that organisations conduct a reasonable and timely evaluation of suspected breaches, and typically do so within 30 days.
Personal information that is often impacted is:
- Names and addresses of customers.
- Email addresses
- Driver licence details
- Passport information
- Medicare information
- Financial account details
- Records of employees (if applicable)
Knowing these thresholds beforehand allows businesses to be ready to respond in a sense of certainty and not just reacting in the middle of a crisis.
Data breaches are not always cyberattacks
The fallacy is that only high tech hackers are responsible for reported breaches.
The OAIC Notifiable Data Breaches Report: July to December 2025 found that, while malicious or criminal attacks continued to be the No.1 cause of notifications, human error was a significant factor in a large proportion of incidents.
Common causes include:
- Phishing campaigns
- Business email compromise
- Ransomware
- Misdirected emails
- Lost laptops or mobile phones
- Weak passwords
- Unauthorised employee access
- The inability to access the cloud storage because of incorrect permissions.
- Third-party supplier incidents
A number of these risks can be mitigated by improving internal processes and employee consciousness.
Build a practical response plan before you need it
All businesses dealing with personal information should have a plan for data breaches Australia outlined in writing.
The plan needs to go beyond a focus on technical recovery and describe who will be responsible for each phase of the response effort.
A working response plan should contain:
- Employees are expected to report any suspected breaches.Employees should report any suspected breaches.
- Internal escalation procedures
- Roles and responsibilities
- Steps to contain affected systems.
- Evidence preservation requirements
- Legal assessment process
- Customer communication procedures
- OAIC notification process
- Post-incident review
The OAIC suggests that response plans be tested regularly to ensure that the employees know what to do in the event of a real incident.
Strengthen your everyday cybersecurity controls
While technology won't prevent every risk, standard security protocols have a great deal to offer in lowering the chances for an attack to be successful.
The Australian Cyber Security Centre (ACSC) advises organisations to adopt security controls suitable to their size and risk profile and suggest using Essential Eight mitigation strategies.
The key security measures are:
- Enable multi factor authentication (MFA)
- Install security patches ASAP
- Encryption for portable devices and laptops.
- Keep secure offline / immutable copies.
- Restrict administrative privileges
- Install endpoint detection and anti-virus software.
- Eliminate unnecessary accounts of users.
- Regularly review access permissions
These controls will mitigate risks related to ransomware, credential theft and unauthorised access.
Employees remain your first line of defence
Technology won't eliminate errors.
Staff should be trained regularly on identifying and dealing with the common security threats.
Training should cover:
- Identifying phishing emails
- Verifying payment requests
- Secure password practices
- Appropriate procedures to maintain customer confidential information.
- Notify of unusual activities as soon as possible
- Secure remote working
- Protecting portable devices
The Australian Cyber Security Centre found that many incidents were contained before the release of sensitive information due to employees reporting incidents promptly.
Don't ignore third-party risk
Firms have more and more been turning to cloud platforms, payroll providers, CRM, marketing software and managed service providers.
Even if your system is secure, a supplier who stores or processes your customer information could present a risk.
As you look at contracts with suppliers, ask yourself the following questions:
- Security responsibilities
- Data ownership
- Notification timeframes
- Incident response obligations
- Data retention requirements
- Protect Data Destruction Procedures
The OAIC urges organisations to find out how service providers process personal information prior to entering into commercial arrangements.
Respond quickly when an incident occurs
A structured response minimises the confusion and enables organisations to fulfil their legal responsibilities.
Incident response checklist
| Stage | Key actions |
| Identify | Confirm suspicious activity and preserve evidence |
| Contain | Isolate affected systems and prevent further access. |
| Assess | Determine what information has been affected and whether serious harm is likely |
| Notify | If required, notify the OAIC and affected individuals as soon as practicable after completing the assessment |
| Recover | Restore systems securely and monitor for further compromise |
| Review | Identify lessons learned and update policies, training and technical controls |
The OAIC believes that notices ought to be where they are clear to understand, listing what occurred, what information was engaged, how this may affect individuals, and what measures might be taken to help protect themselves.
Privacy governance extends beyond cybersecurity
Protecting against hackers is not the only part of Meeting Privacy Act 1988 business obligations.
Another component of good privacy governance is auditing the use of personal data over the course of its life cycle.
Good governance practices comprise:
- Only gather data that is relevant and necessary to the business.
- For security and privacy, restrict employee access with role restrictions.
- Maintain an up-to-date privacy policy.
- Properly get rid of data that is not needed anymore.
- Regularly review information handling procedures.
- Record Privacy obligations throughout the enterprise.
These measures not only ensure adherence to the Australian Privacy Principles but also minimize the risk of unintentionally disclosing information.
Preparation reduces both operational and regulatory risk
Often, the financial loss of a breach goes beyond the cost of the system recovery. The organisation might have to dig into the incident, hire legal counsel, inform customers and resume their operations.
The OAC repeatedly advises that organisations with formalised response plans are more likely to limit the impact on affected people, determine legal responsibilities and manage incidents.
Similarly, the Australian Cyber Security Centre advises that, to enhance the overall resilience, a combination of technical protections should be implemented alongside governance, training staff and regularly reviewing business processes.
Data breach readiness is more than just a compliance issue. It is focused on safeguarding business continuity, keeping customers' trust, and responsibly handling personal data throughout the organisation.
Source
Office of the Australian Information Commissioner (OAIC): Data Breach Preparation and Response Guide; Notifiable Data Breaches Scheme; Notifiable Data Breaches Report: July to December 2025
Australian Cyber Security Centre (ACSC): Essential Eight Maturity Model; Annual Cyber Threat Report 2024–25
Federal Register of Legislation: Privacy Act 1988 (Cth)
Australian Taxation Office (ATO): Data Breaches and Identity Security Guidance for Businesses
Pooja Malik is a business journalist with over six years of experience covering startups, entrepreneurship, and emerging trends. She has previously worked with leading media platforms such as YourStory Media and BW BusinessWorld, where she reported on business, policy, and market developments. Currently, she serves as Editor at The Inspirepreneur Magazine, where she writes and edits stories across business, lifestyle, and travel, with a focus on clarity, accuracy, and reader relevance.
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