Home / CPA Course / ISC

Availability

ISC Chapter 3 · Area I · Blueprint I.A.3

A system that is correct but down is no use to anyone. Last Black Friday Brightwater's website went dark for four hours, and Mr. Brooks wants to know it will never happen again. Priya and Sam build the answer step by step: what business continuity and disaster recovery plans are for, how a business impact analysis sets recovery targets, how availability is measured, how mirroring, replication and recovery sites keep systems running, which backup type fits which need, and finally how a SOC 2 auditor tests PayLoom's availability controls. Every idea here is something you can picture: a server, a clock and a plan.

In this chapter

1. Resiliency, business continuity and disaster recovery
2. Business impact analysis: setting the clock
3. Measuring availability
4. Redundancy: mirroring, replication and recovery sites
5. Backups: full, incremental and differential
6. Testing availability controls in a SOC 2 engagement

This chapter has 6 lessons, 50 practice MCQs with explanations and 20 simulations, plus flashcards and a recall sheet.

What this chapter covers

• Business resiliency, continuity and disaster recovery
• mirroring and replication
• business impact analysis
• availability measures
• full, incremental and differential backups

Chapter 2: Enterprise and accounting information systems · Chapter 4: Change management