Business Continuity, Disaster Recovery and Backup Engineering — DedSec Project

Purpose: Design recovery capabilities that remain usable when systems, identities, facilities, providers, or data are unavailable.

Three related disciplines

Business continuity keeps critical business processes operating. Disaster recovery restores technology capabilities. Backup engineering preserves recoverable copies of data/configuration.

They overlap but are not interchangeable.

Business impact analysis

Identify critical processes and their dependencies:

• people;
• identity;
• applications;
• databases;
• networks;
• DNS;
• SaaS/cloud providers;
• facilities;
• suppliers;
• communication channels.

Recovery objectives

RTO: target time to restore a service. RPO: maximum tolerable data-loss window.

These should be business decisions informed by technical feasibility and cost.

Backup design

Consider independent copies, geographic/provider separation where needed, immutable/offline options, encryption, key recovery, privileged-access separation, retention, and monitoring.

Backups should include more than user data when recovery depends on configuration, certificates, infrastructure code, application packages, or identity systems.

Restore testing

A successful backup job is not a successful recovery. Test:

• file restore;
• database restore;
• application restore;
• identity dependency;
• key/certificate availability;
• clean-room recovery;
• time required;
• integrity checks.

Dependency maps

Recovery plans fail when teams restore components in the wrong order. Document upstream dependencies and minimum viable service chains.

Crisis communications

Maintain out-of-band contacts and communication channels that do not depend on the affected identity or collaboration platform.

Provider failure

Cloud and SaaS improve resilience in many scenarios but create provider and account dependencies. Define export/backup capability, alternative communication, and administrator recovery.

Exercises

Use increasing realism:

1. checklist review;
2. tabletop;
3. component restore;
4. partial service recovery;
5. full disaster-recovery exercise.

Record lessons and assign remediation owners.

Lab — Recovery proof

Create a small local service with configuration and sample data. Back up both. Delete the working copy, restore from backup, verify hashes/data, and record actual recovery time. Repeat after changing one undocumented dependency and observe the failure.

Learning goal: recovery capability must be demonstrated, not assumed.

Recovery engineering in more depth

Business continuity keeps critical work functioning; disaster recovery restores technology; backup engineering preserves recoverable copies. They overlap but answer different questions.

RTO and RPO

RTO describes how quickly a service should be restored. RPO describes how much data loss in time is acceptable. These targets must be tied to real business processes and tested against observed recovery performance.

Dependency mapping

A recovery plan for an application is incomplete if it ignores identity, DNS, certificates/keys, network configuration, storage, secrets, external providers, build artifacts, licenses, and administrators' access paths.

Clean recovery

After a security incident, restore from a known-good point, rotate compromised identities/secrets, patch the entry condition, validate configurations, and monitor before declaring recovery complete. Reconnecting a restored but still vulnerable system can recreate the incident.

Exercises

Use tabletop, partial restore, and full technical recovery exercises at appropriate intervals. Record gaps, owners, deadlines, and actual recovery times. A runbook that has never been exercised is an assumption.

Guided study workflow

Before you begin

Modules 23 and basic backup concepts.

Practice task

Back up disposable lab data, record RPO/RTO targets, delete/alter the disposable copy, restore it, verify integrity, measure actual recovery time, and update the runbook.

Continue with

Recommended next modules: 38, 49, 59.