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

Table 12.3 continued Factors Associated with Different Types of Backups
Speed of
Speed of Making Restoring the Disadvantages of
Type of Backup the Backup Backup Backup Type
Full Backup Takes longer to Faster to restore Each time a backup
with Daily backup data than incremental is performed, all
Differential than incremental backups, as only data modified since
Backups backups. the last full the last full backup
backup and (including that which
differential was backed up in the
backup is needed last differential
to perform backup) is backed up
the restore. to tape. This means
that data contained
in the last differen-
tial backup is also
backed up in the
next differential
backup.

Alternate Sites

Alternate sites are important to certain companies, so that they experience minimal
downtime or almost no downtime at all.When a disaster occurs, a company
requires a temporary facility in which data can be restored to servers, and business
functions can resume.Without such a facility, the company would need to find a
new business location, purchase and set up new equipment, and then go live.When
a company is not prepared, such activities can take so long that the disaster puts
them out of business.

■ A hot site is a facility that has the necessary hardware, software, phone lines,
and network connectivity to allow a business to resume normal functions
almost immediately.This can be a branch office or data center, but must be
online and connected to the production network.A copy of the data is
held on a server at that location, so little or no data is lost. Replication of
data from production servers may occur in real time, so that an exact
duplicate of the system is ready when needed. In other instances, the bulk
of data is stored on servers, so only a minimal amount of data needs to be
restored.This allows business functions to resume very quickly, with almost
zero downtime.

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