Disaster Recovery — CC Study Guide

Bundled into the existing Certified in Cybersecurity premium course — no separate purchase.

Included in this chapter:

Site type	What is already there	Recovery speed	Cost
Cold site	Space, power, connectivity only; no IT equipment	Slowest (days)	Lowest
Warm site	Partly equipped: some hardware, software, and connectivity	Moderate (hours to a day)	Medium
Hot site	Fully running duplicate, data kept current	Fastest (minutes)	Highest

Cheat sheet

Disaster recovery restores the IT systems and data after a disaster
DR restores the technology; business continuity keeps the mission running
RPO is the maximum data loss you can accept, measured as time
RTO is the maximum downtime you can accept before restoring
RPO is about data lost; RTO is about time down
A tighter RPO or RTO costs more
Reliable, tested, offsite backups are the foundation of recovery
RAID and replication are redundancy, not backup
A recovery site is the alternate location you fail over to
A cold site is empty space, cheapest and slowest
A warm site is partly equipped, a middle ground
A hot site is a running duplicate, fastest and priciest
Cost and recovery speed rise together from cold to warm to hot
Restore the most critical systems first, following the BIA
An untested DR plan is unproven
The 3-2-1 backup rule keeps 3 copies on 2 media types with 1 copy offsite
Incremental and differential backups trade backup speed for restore complexity
Redundancy eliminates single points of failure to protect availability
Failover automatically switches operations to a standby system when the primary fails
A tabletop exercise validates a plan through discussion, without touching production

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