Server
OT Backup Server
The system holding recoverable copies of OT configurations, images, projects and logic.
Critical criticalityLevel 3
What it does
Stores and verifies backups needed to restore operations after an incident.
Typically locatedSite operations zone with offline or immutable copies elsewhere.
At a glance
PurdueLevel 3
CategoryServer
Protocols
Talks toOT servers and workstations, Controller project repositories, Offline media
Common vendorsMultiple
Why should I care?
OT Backup Server sits at Level 3. Compromise here is not just a data problem — it changes what the physical process does or what operators can see and control.
Common security problems
- Backups online and reachable from compromised hosts
- Never restore-tested
- Missing controller logic and firmware
If it is compromised
- Recovery capability destroyed — the difference between hours and weeks of downtime
What to monitor
- Backup job success
- Deletion and retention policy changes
- Administrative access
How to defend it
- Offline or immutable copies
- Restoration testing on a schedule
- Include PLC logic, HMI projects, firmware and licences
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