NIST SP 1339
OT Backup Quick Start Guide
Everything you need to know about the new NIST standard for operational technology backups, what it asks you to do, and why a physically disconnected gold copy is the most direct way to meet it.
In June 2026 the National Institute of Standards and Technology, through the National Cybersecurity Center of Excellence, published NIST Special Publication 1339, the Operational Technology Backup Quick Start Guide. The document is short, but it lands at a moment when industrial ransomware and destructive attacks on OT estates are a board-level risk.
The guide does not introduce new theory. It distils the backup and recovery requirements that already exist in NIST SP 800-82 Rev. 3, NIST SP 1800-11 and the NIST Cybersecurity Framework 2.0 into a single checklist that asset owners, CISOs and plant engineers can use immediately. The core message is that OT backups are not an IT afterthought; they are a safety and resilience control.
Four work areas that make an OT backup programme defensible
SP 1339 breaks effective OT backup management into four practical areas. Each one needs to be documented, tested and reviewed during recovery exercises.
Identify assets critical to operations
Map every OT device that contains important configurations or supports process operation: PLCs, switches, firewalls, transmitters, actuators, DCS, SCADA servers, VFDs and HMIs. Verify the inventory is current and assign mission criticality to prioritise backup frequency, retention policies and recovery sequence.
Identify the backups each asset needs
Capture the files, software, spare parts and documentation needed to restore the environment: program files, logic files, configuration files, I/O lists, firmware, graphics, licence keys, vendor tools, operating system or virtual machine images, and supporting software. Maintain a spare parts plan that meets recovery time objectives and is compatible with the digital backups.
Manage backup and recovery procedures
Define backup frequency, media and storage locations based on how often information changes and the risk profile of each system. Document OT-specific constraints, route backup-impacting changes through change management, label media, maintain redundant on-site and off-site storage, and protect media from unauthorised access, modification or destruction.
Test integrity and restoration
Conduct recurring restore tests on non-production systems to validate backup reliability, practise restoration procedures and verify the functional integrity of the restored system. Use file hashes where feasible, and update backup and restoration processes based on lessons learned during testing.
The goal is not more backups. It is recoverable, verifiable OT data.
Save engineering documents for a layered recovery
A backup of the logic or configuration is not always enough to rebuild a process. SP 1339 reminds organisations to keep supplemental engineering documents in both printed and electronic formats, and to make sure they are available during incident response. These documents can speed up verification, validation and troubleshooting during restoration.
Offline secure storage that meets the NIST guidance directly
Firevault gives you the protected, redundant, integrity-checked storage that SP 1339 describes, with a physical air gap that removes the attack surface entirely.
Offline gold copy
SP 1339 asks organisations to maintain the integrity and availability of backups through hashing, encryption and write-once media. Firevault adds a physical air gap: the vault has no network interface while offline, so remote ransomware cannot reach the gold copy.
Tamper-evident audit trail
Every connection, disconnection and access is logged on a separate management plane with identity, timestamp and reason. This gives you the evidence insurers, regulators and board reports expect when you need to prove that a backup remained untouched.
Bunker storage and encryption
Data is stored in hardened bunkers on two physical drives, protected by quantum-resistant encryption, with strict access controls and no shared tenancy. That directly addresses the SP 1339 requirement to protect backup media from unauthorised access, modification or destruction.
Restore at disk speed
When a recovery exercise or real incident demands it, your OT gold data is available through scheduled, identity-verified connection windows. Restores run at disk speed, not tape speed, and every action is logged for your incident record.
Continue reading on OT security, air-gapped storage and ransomware resilience.
NIST SP 1339, common questions
Bring your OT backups in line with NIST SP 1339
Talk to the Firevault team about a physically disconnected gold copy for your OT/ICS environment, with the audit trail and bunker storage the standard expects.
Takes about 2 minutes. No account needed.