Too much voltage for a short period of time is a spike.
Too much voltage for a long period of time is a surge.
Not enough voltage for a short period of time is a sag or dip
Not enough voltage for a long period of time is brownout
A short power interruption is a fault
A long power interruption is a blackout
You MUST know all of the power issues above for the purpose of the exam.
From: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 3rd. Edition McGraw-
Hill/Osborne, 2005, page 368.

It is critical that a determination be made of WHAT data is important and should be
retained and protected. Without determining the data to be backed up, the potential for error
increases. A record or file could be vital and yet not included in a backup routine. Alternatively,
temporary or insignificant files could be included in a backup routine unnecessarily.
The following answers were incorrect:
When to make backups Although it is important to consider schedules for backups, this is done
after the decisions are made of what should be included in the backup routine.
Where to keep backups The location of storing backup copies of data (Such as tapes, on-line
backups, etc) should be made after determining what should be included in the backup routine
and the method to store the backup.
How to store backups The backup methodology should be considered after determining what data should be included in the backup routine.

The best description of the objectives of the Business Impact Analysis (BIA) is identifying what is important and critical based on disruptions that can affect the organization. A BIA is a process that involves the identification, analysis, and evaluation of the potential impacts or consequences of the disruptions or interruptions that may affect the organization, such as natural disasters, human errors, or cyberattacks. A BIA can help to determine the criticality, priority, or dependency of the business functions, processes, or activities, as well as the resources, assets, or systems, that support or enable the business functions, processes, or activities, by using various methods or techniques, such as interviews, surveys, or simulations, to collect or gather the relevant data or information, such as the recovery time objectives, recovery point objectives, or maximum tolerable downtime, that can measure or quantify the impacts or consequences of the disruptions or interruptions. A BIA can also help to identify the requirements, strategies, or solutions, such as backup, redundancy, or contingency, that can prevent, mitigate, or recover from the impacts or consequences of the disruptions or interruptions, by using various methods or techniques, such as risk assessment, gap analysis, or cost-benefit analysis, to evaluate or compare the risks, gaps, or costs of the disruptions or interruptions, as well as the benefits, advantages, or effectiveness of the requirements, strategies, or solutions. Identifying the events and environmental factors that can adversely affect an organization, establishing the need for a Business Continuity Plan (BCP) based on threats that can affect an organization, or preparing a program to create an organizational awareness for executing the Business Continuity Plan (BCP) are not the best descriptions of the objectives of the BIA, as they are either more related to the concepts of risk analysis, business continuity planning, or business continuity management, which are the processes that are performed or supported by the BIA, rather than the BIA itself. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 7:
Security Operations, page 443; CISSP Official (ISC)2 Practice Tests, Third Edition, Domain 7: Security Operations, Question 7.12, page 275.