# Can You Restore Your Vessel's Critical Systems at Sea — Without Calling Shore?
If a ransomware attack encrypts your ECDIS or propulsion management system at 0200 in the middle of the North Atlantic, your recovery capability is only as good as your last verified backup. Most crews discover the gaps at the worst possible moment.
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**What UR E27 Requires**
IACS UR E27 mandates that every Computer-Based System aboard a vessel must support backup operations without interrupting or measurably degrading normal operations. Beyond simply having backups, it requires a documented inventory identifying every essential file — configuration data, software, calibration files, and licensing information — along with the secure, documented storage location of each.
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**Why This Is Different at Sea**
A shore-based IT team can schedule backups during off-hours and tolerate a brief performance dip. A vessel's integrated automation system cannot pause propulsion management at 03:00 to run a backup job.
The operational consequence is stark: if your backup process competes with resources managing engine control or dynamic positioning, you have introduced a cyber-physical risk. UR E27 closes that gap by design, not assumption.
Equally important — if your backup media is locked in a sealed cabinet requiring a shore-based specialist to access, it is operationally useless during an incident at sea.
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**The IEC 62443-3-3 Technical Layer**
SR 7.3 under Foundational Requirement 7 (Resource Availability) scales across Security Levels SL 1 through SL 4, with higher levels demanding increasingly rigorous verification and integrity controls.
One detail many practitioners overlook: SR 7.3 requires that backup integrity be **verifiable independently** — without executing a full system restoration. This means checksum validation, hash verification, or equivalent mechanisms must be in place so crews can confirm a backup is usable before they actually need it.
IEC 62443-3-3 also strongly recommends maintaining offline backup media physically onboard, precisely because vessel connectivity cannot be assumed during an incident requiring disconnected restoration.
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**Implementation Reality 🔧**
The practical challenge most vessels face is not the backup itself — it is the verification step. Scheduling a read-only integrity check against backup media during low-traffic operational windows, logging the result, and making that log available to the crew without specialist software is achievable but rarely implemented by default. That gap is where auditors consistently find non-conformance.
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**A question for practitioners:** Has your vessel's backup integrity ever been verified independently — not by running a restoration, but by a documented checksum or hash check against the stored media?
📌 Post 26/41 in my IACS UR E27 series — breaking down all 41 requirements
#SystemBackup #IACS #URE27 #IEC62443 #MaritimeCyberSecurity #BusinessContinuity #Recovery
