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752 Chapter 12 • Operational and Organizational Security: Policies and Disaster Recovery

Full backups will backup all data in a single backup job.When each file is
backed up, the archive bit is changed to indicate that the file was backed
up.

Incremental backups will backup all data that was changed since the last
backup.When each file is backed up, the archive bit is changed.

Differential backups will backup all data that has changed since the last full
backup.When this type of backup is performed, the archive bit is not
changed, so data on one differential backup will contain the same
information as the previous differential backup plus any additional files
that have changed.
Copy backups will make a full backup, but does not change the archive
bit. Because the archive bit is not marked, it will not affect any
incremental or differential backups that are performed.

Grandfather-Father-Son rotation organizes a rotation of backup tapes into
a daily, weekly, and monthly set of tapes.

Alternate sites should be identified to provide an area that business
functions can be restored.There are three options for alternate sites: hot,
warm, and cold.

Business Continuity

A Business continuity plan may incorporate a number of different plans to
ensure the business’s ability to continue key functions after an incident.
These plans may include a disaster recovery plan, business recovery plan,
business resumption plan, and contingency plan
Business recovery plans address how business functions will resume after a
disaster at an alternate site

Business resumption plans address how critical systems and key functions
of a business will be maintained
Contingency plans address what actions can be performed to restore
normal business activities after a disaster, or when additional incidents
occur during this process
UPS can be used to ensure a business can continue functioning for a
limited time after a power outage.

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