Defence in depth fails most often in the gaps between layers, not in the tools themselves. This is why it must be treated as an architecture decision and not a theoretical model.
The ACSC Annual Cyber Threat Report 2025 recorded a 23 percent increase in cybercrime reports across Australia, with many incidents involving weaknesses between layers rather than missing controls.
The way an organisation structures its security architecture now has a direct impact on its resilience in 2026.
Building Security Layer by Layer
A modern environment demands security that operates across multiple layers at the same time. IDC APAC Hybrid Cloud Security Research 2025 found that more than 70 percent of organisations in the region struggle with consistent governance and alignment across hybrid environments.
When security controls are designed independently rather than as a unified architecture, gaps emerge. These gaps are now among the most common contributors to incidents.
Storage platforms also now include deep security capability. Immutability, encryption, threat monitoring, recovery validation and secure administration are all widely adopted features across leading enterprise storage solutions. These controls strengthen the data layer and support regulatory and resilience requirements.
Strengthening the Perimeter
A defence in depth model begins at the perimeter. Threat actors continue to target edge infrastructure across Australia. The ACSC 2025 report highlighted this trend, reinforcing the need for strong perimeter inspection, visibility and intelligence.
Effective perimeter controls include:
- Antivirus and anti-malware
- Web filtering
- Deep packet inspection
- Real time threat intelligence
- Continuous anomaly monitoring
These controls work together to identify and block activity before it reaches critical systems.
Recovery as a Security Layer
One of the most important architecture decisions for 2026 is treating backup as part of cybersecurity.
Gartner Data Security Hype Cycle 2025 projected that by 2026, 60 percent of enterprises will integrate backup into their security strategy.
Modern backup platforms contribute to security by delivering:
- Immutable copies
- AI supported anomaly detection
- Isolated or air gapped recovery
- Encryption enforcement
- SOC and SIEM integration
The Commvault ANZ Ransomware Trends Report 2025 confirmed that attackers now frequently target backup infrastructure early in an attack sequence. Recovery architecture must be designed to withstand these attempts.
A Unified Security Framework
A defence in depth strategy only works when layers are aligned.
IDC ANZ Security Architecture Insights 2025 highlighted misalignment between identity, perimeter, data and recovery controls as one of the most common contributors to major incidents.
This is where deliberate design decisions matter. When each layer is architected to reinforce the others, organisations strengthen resilience, reduce operational risk and improve compliance outcomes.
Meridian IT’s Role in Enabling Defence in Depth
Once the architectural approach is defined, technology selection and operational execution become critical.
Meridian IT works with vendors such as NetApp, Fortinet and Commvault to deliver best of breed solutions, aligned controls across the perimeter, data and recovery layers. These capabilities support immutability, encryption, monitoring, isolation and rapid recovery, helping organisations close the gaps that adversaries increasingly exploit.
Defence in depth is the outcome of many architecture decisions made consistently over time. As organisations prepare for 2026, these decisions will determine how securely and confidently they operate.
To learn more or speak to our technical specialists, contact us:
• Email: info@meridianit.com.au
• Website: www.meridianit.com.au
• Phone: (02) 8870 9000