Industrial Cybersecurity & OT Risk calculator

Cyber Recovery Spares Buffer Calculator

Use this calculator to estimate recovery spares buffer for OT cyber resilience. It supports planning for spare workstations, network devices, storage media, controller hardware, power supplies, and prepared recovery kits used during restore or rebuild work.

What this calculator does

  • Estimate required recovery spares inventory for cyber recovery using daily demand, replenishment lead time, and safety stock.
  • Use it when sizing spare HMIs, industrial PCs, network gear, storage media, and recovery kits for OT resilience.
  • The result estimates required spares inventory and days covered.

Formula used

  • Cyber recovery spares cycle stock = daily recovery spares demand × recovery spares replenishment lead time
  • Required cyber recovery spares inventory = cycle stock + recovery spares safety stock

Inputs explained

  • Daily recovery spares demand: Use expected issue rate for spare endpoints, switches, storage media, controllers, power supplies, or rebuild kits during recovery.
  • Recovery spares replenishment lead time: Enter vendor lead time, internal staging time, repair lead time, shipping time, or procurement delay.
  • Recovery spares safety stock: Add buffer for supplier risk, multiple site events, failed parts, validation rejects, and extended recovery operations.

How to use the result

  • Use it to size recovery kits, spares budgets, and procurement plans for OT resilience.
  • It depends on realistic demand and lead time assumptions and does not replace tested recovery procedures.

Common questions

  • What is the cyber recovery spares buffer calculator for? It estimates spare inventory needed to support OT cyber recovery and rebuild work.
  • What information should I enter? Use daily spares demand, replenishment lead time, and safety stock.
  • What does the result tell me? The result helps decide whether spares levels can support recovery objectives.
  • When is the result only an estimate? It is only an estimate when supplier lead time, hardware failure rate, or recovery scope changes.

Last reviewed 2026-05-12.