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Restore a school’s systems only after the incident is being contained, responders have assessed what may be affected, and the recovery environment is kept clean. Then bring services back in an order based on student and staff safety, essential school operations, and the systems each service depends on—not simply which system is easiest to restore. Use tested, offline backups, reconnect in stages, and coordinate technical work with school leadership and communications staff.
Contain the incident before restoring systems
Recovery is part of a coordinated incident response, not a standalone IT task. Ransomware can make systems inaccessible and disrupt remote learning; an attack may also involve the theft and threatened disclosure of confidential student data. CISA’s K-12 cybersecurity report and its broader #StopRansomware guidance both emphasize response planning and containment alongside recovery.
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Activate the response plan and coordinate roles
Use the school or district’s written incident-response plan to establish who is leading technical decisions, who is updating senior leaders, and who is responsible for communications. Keep school leadership informed as the situation changes. If the plan does not clearly assign these responsibilities, coordinate them before restoration decisions begin.
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Identify systems known or suspected to be affected and isolate them from the network. If the incident may have spread more broadly, responders may need to isolate a network segment rather than handling devices one at a time. The purpose is to limit further impact while preserving a controlled environment for investigation and recovery.
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Establish scope and preserve evidence
Review available endpoint and network evidence, along with relevant logs, to understand which systems are affected and whether the compromise may extend beyond the first visible devices. Preserve volatile evidence where possible, as CISA advises. Coordinate with experienced incident responders or law enforcement when appropriate; avoid treating the first apparent point of failure as the full extent of the incident.
Choose the recovery order by critical service and dependency
Start with the school’s critical-asset list and identify which services support health and safety, core school operations, and other critical needs. Then map the dependencies those services require. A service may not be usable if its identity, network, or data systems are still unavailable or untrusted.
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For each candidate service, ask:
- What school function depends on it, and how critical is that function?
- Which identity, network, data, or other services must be available first?
- Has the supporting system been assessed and prepared for recovery?
- Can the service be reconnected in a monitored stage rather than all at once?
This avoids prioritizing a system merely because it is highly visible or convenient to restore. CISA’s #StopRansomware Guide (September 2023) puts the principle plainly: “Reconnect systems and restore data from offline, encrypted backups based on a prioritization of critical services.”
Make sure recovery sources are trustworthy
Use offline, encrypted backups and test restoration
CISA recommends keeping backups of critical data offline and encrypted, then regularly testing their availability and integrity in a disaster-recovery scenario. CISA’s K-12 cybersecurity report also recommends regular backups of key systems and testing both partial and full data restoration. A backup that exists but cannot be accessed or restored reliably is not a proven recovery source.
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Document backup arrangements in a written plan, including which critical systems and data they cover. A removable external drive can be one medium for offline copies, but it should not remain connected when it is not actively being used for backup: CISA warns that a threat actor may be able to access, delete, or corrupt connected data. Buying a drive alone does not establish that copies are complete, protected, or restorable.
Keep rebuilding separate from potentially compromised systems
Use a clean recovery environment and keep potentially compromised systems out of it. Where appropriate, rebuild systems from maintained golden images—known system images CISA recommends keeping for critical systems. Scan or otherwise validate backup data where possible before restoring it. These measures help reduce the risk of bringing compromised material into systems being returned to service.
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Restore in controlled stages and monitor reconnection
- Prepare the recovery environment. Keep it separate from systems that may still be compromised, and use maintained system images where appropriate.
- Validate the recovery source. Check backup availability and integrity, and scan or otherwise validate backup data where possible.
- Restore by service priority. Follow the critical-service order and account for dependencies, rather than restoring systems in isolation.
- Reconnect deliberately. Add only systems that have been checked and prepared for recovery. Reconnect in stages and monitor as systems return to the network.
CISA specifically warns against reinfecting clean systems during recovery. If a system or its recovery source has not been checked and prepared, do not treat it as ready to reconnect.
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Keep leadership updated and coordinate accurate internal and external communications as the situation develops. Because a school incident can affect learning and may involve sensitive student information, include the people responsible for school communications in the response—not just the technical team.
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Follow the school’s applicable breach-notification requirements. Those obligations vary by jurisdiction and circumstances, so this general recovery guidance does not determine which notices are legally required or when they must be sent. Document decisions and lessons learned after the incident, and use them to update the written response plan and future exercises.
Practice the recovery plan before it is needed
CISA’s K-12 cybersecurity report recommends an exercised written incident-response plan with assigned roles and senior-leader approval. CISA also recommends regular backup tests, including partial and full restoration. A useful exercise should establish whether the school can identify critical services and dependencies, access offline recovery sources, restore data, and coordinate roles under the written plan.
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