Understand the concept
Defense in depth uses multiple independent safeguards: patching, least privilege, authentication, segmentation, logging, and backups. No single tool prevents every failure.
Risk depends on assets, threats, vulnerabilities, and likely impacts. A home server benefits from a small inventory and clearly documented recovery plan.
TRY IT YOURSELF
Practice task
Make an inventory of services and mark which should remain private. For each service, record its update and backup plan.
CHECK YOUR UNDERSTANDING