Storage


system is designed to be fully offline by default, immune to credential theſt and unreachable by hackers. Te heart of the system is something like an airlock for critical


data, a patented technology that transfers data across two physical air gaps. Kirm likened it to an airlock in a bank vault: one door opens, then closes before the next opens, ensuring that both are never open simultaneously. “Tese bridges are never open together,” he said. “Te backend of the device, the offline vault, is never accessible online. Not even for a second.” Eškić elaborated on the technical foundation. “All data flows


are made inside the HyperBunker with optocoupling devices,” he explained. “You have one source of light and one sensor. Te source sends information one way, but the sensor can never send anything back, and this is the concept of the complete HyperBunker.” Inside the device are four cold offline storages, industrial-grade


SSDs that remain disconnected from power supplies except during backup or restore operations. “Tree of them are always completely turned off,” Eškić said. “So that we protect your data from any kind of influence from outside.”


From recovery to resilience HyperBunker’s design reflects lessons learned from decades of data recovery. Eškić recalled the frustration of early ransomware cases, when recovery was impossible without paying attackers for private keys. “We figured that you cannot recover the data without contacting the bad guys,” he said. “So, we started to experiment with data diode technology, to separate customer data from the online network, to make it invisible or unavailable in the moment of attack.” Tat experimentation evolved into HyperBunker’s optocoupling


approach, validated by academic partners and now protected by patents in the United States, Europe, and Croatia. Te system is controlled only through a physical touchscreen interface on the device itself. “Even we, as the provider, cannot access the HyperBunker online,” Eškić said. “Tere is no possibility of doing anything from outside. You need to be on-prem and in front of the device to control it.” Te company positions its solution not as a replacement for


cloud or on-premises storage, but as a final line of defence. “We don’t want to fight with them,” Kirm said of cloud providers. “We can be in the market together. We are the last line of defence, an additional layer of security.” He pointed out that while tape remains a standard offline


backup method in critical infrastructure, it can take weeks to restore. HyperBunker aims to fill that gap by combining offline resilience with faster recovery. “Te worst place to protect against ransomware is the cloud,” Kirm argued. “From our experience, everything that is online is hackable. HyperBunker is purely hardware-based. We don’t use any credentials, because we are fully offline.” Te company has already conducted more than 80 technical


demonstrations with critical infrastructure teams and incident responders. “Nobody said that this solution wouldn’t cover the gap in the market,” Kirm noted. “All of them said it is simple and effective as it should be.”


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Towards a standard of offline custody HyperBunker’s ambitions extend beyond the enterprise market. Te company is exploring ruggedised versions for defence and field environments, where mission-critical systems demand resilience. Te business model is subscription-based, with hardware included


and supported by regional partners. Quarterly restore checks are built into the service level agreement, assuring customers and auditors alike. “Imagine you have critical data on some safe site. Of course, you want to know if it’s still there,” Kirm explained. “Tat’s why we provide quarterly restores, and we let them know with the report that the data is here and is intact.” Te company recently raised €800,000 in seed funding and


delivered its first 20 units. Serial production is planned for the coming year, with batches of 100 devices and expansion into new regions. Partnerships with insurers and defence accelerators are also on the horizon. For Kirm, the broader goal is to establish offline resilience as a


new standard. “We don’t only offer offline resilience; we offer data custody. We don’t have access to that data, and we cannot touch it. Te data is yours, on that box.” Eškić echoed the sentiment, returning to the origins of the project.


“Today, we have 65 professional tools against ransomware, but we are still talking about ransomware,” he said. “So, we identified the gap, and HyperBunker is, in our opinion, the solution for that.” Just as civilisations once built walls to protect their cities, the


digital age demands walls to protect its data. HyperBunker’s founders believe they have built one that attackers cannot breach.


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