Security Incident Response Plan

Help me draft a security incident response plan.

Organisation type: {{e_g_50_person_saas_company_healthcare_pr}}
Critical systems: {{list_your_most_important_systems_and_dat}}
Current security tools: {{list_what_you_have}}
Team: {{who_is_responsible_for_security_is_there}}
Most likely threats: {{e_g_phishing_ransomware_data_breach_insi}}

Please create:
1. Incident severity classification (P1–P4 with examples)
2. First-hour response checklist for a suspected breach
3. Communication plan (who to notify and when)
4. Containment and recovery steps for your top 2 threat scenarios
5. A post-incident review template

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