System availability and business continuity
Area 1: Information Systems and Data Management (35-45%)
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Topics
- Business continuity planning
- Disaster recovery strategies
- High availability architectures
Study Frameworks
Disaster Recovery Site Selection
Does the organization require near-zero downtime (RTO measured in minutes)?
Yes
Hot site — fully operational duplicate environment, data synchronized in real-time, highest cost
No
Can the organization tolerate downtime of several hours (RTO measured in hours)?
Yes
Warm site — partially configured with hardware, requires data restoration, moderate cost
No
Cold site — empty facility with power/connectivity only, requires full setup, lowest cost, RTO in days
Recovery Point Objective (RPO)
RPO = Maximum tolerable data loss (measured in time)
The maximum acceptable amount of data loss measured in time. RPO of 1 hour means backups must occur at least hourly. Drives backup frequency decisions.
Recovery Time Objective (RTO)
RTO = Maximum tolerable downtime (measured in time)
The maximum acceptable time to restore systems after a disruption. RTO of 4 hours means systems must be operational within 4 hours. Drives DR site selection.
HWCHot site, Warm site, Cold site
DR site types from fastest to slowest recovery. Hot = real-time sync, minutes RTO, highest cost. Warm = partial hardware, hours RTO. Cold = empty facility, days RTO, lowest cost.