Disaster Recovery






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Disaster recovery

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A Disaster recovery plan covers the data, hardware and software critical for a business to restart operations in the event of a natural or human-caused disaster. It should also include plans for coping with the unexpected or sudden loss of key personnel, although this is not covered in this article, the focus of which is data protection.




1 Business

2 Reasons for Disaster Recovery Plans

3 Preventions Against Disasters

4 The Plan

5 Business Continuity Planning

6 Disaster Recovery Process

7 Related Information

8 Technology

9 Terminology

10 External links and Citations





With the rise in information technology and the reliance on business-critical data, the landscape has changed in recent years in favor of protecting irreplaceable data. This is especially evident in information technology, with most large computer systems backing up digital information to limit data loss and to aid data recovery.


It is believed that some companies spend up to 25% of their budget on disaster recovery plans; however, this is to avoid bigger losses. Of companies that had a major loss of computerized records, 43% never reopen, 51% close within two years, and only 6% will survive long-term. (Cummings, Haag & McCubbrey 2005.)


The current data protection market is characterized by several factors:


Rapidly changing customer needs that are driven by data growth, regulatory issues and the growing importance to access data quickly by retaining it online.

An ever-shrinking time frame for backing up data, which is burdening conventional tape backup technologies.

As the disaster recovery market continues to undergo significant structural changes, the shift presents opportunities for next-generation startup companies that specialize in business continuity planning and offsite data protection such as Iron Mountain, Recall, Switch Communications, Symagio, NetMass, SunGard Availability Services, CyGem and others...



Reasons for Disaster Recovery Plans

There are many different risks that can negatively impact the normal operations of an organization. A risk assessment should be performed to figure out what constitutes a disaster and which risks a specific company is susceptible to, including:


Natural disasters


Power failure

Terrorist attacks

Organized or deliberate disruptions

System and/or equipment failures

Human error

Computer viruses

Legal issues

Worker strikes


Preventions Against Disasters

Backups sent off-site, weekly; therefore at worst no more than one week's worth of data would be lost.

Includes software as well as all data information, to facilitate recovery

Use a Remote backup facility if possible to minimize data loss

Storage Area Networks (SANs) over multiple sites are a recent development (since 2003) which make data immediately available without the need to recover or synchronise it

Surge Protectors - to minimize the effect of power surges on delicate electronic equipment

Uninterruptible Power Supply (UPS)

Fire Preventions - more alarms, accessible extinguishers

Anti-virus software

Insurance on hardware


The Plan

A good plan takes into account many different factors. The most important are:


Telephone Tree - to notify all key personnel of the problem and assign them tasks focused toward the recovery plan.

Recall backups - If backup tapes are taken offsite, these need to be recalled. If using remote backup services, a network connection to the remote backup location (or the Internet) will be required.

Customers - notifying clients about the problem minimizes panic.

Facilities - having backup hot sites or cold sites for larger companies. Mobile recovery facilities are also available from many suppliers.

Knowledge Workers - during a disaster, employees are required to work longer, more stressful hours, and a support system should be in place to alleviate some of the stress.

Business Information - backups should be stored in a completely separate location from the company (Cummings, Haag & McCubbrey 2005.). Security and reliability of that data is key.


Business Continuity Planning

There are several software packages available to make the process of generating a disaster recovery plan easier. An example of this is "BCP Generator", an American software program which is based around MS Word and includes a template and guidelines which guide the managers through creating and implementing a disaster relief program.



Disaster Recovery Process

Buy new equipment (hardware) or repair or remove viruses, etc.

Call software provider and reinstall software

Retrieve offsite storage discs

Reinstall all data from back-up source

Re-enter data from the previous week


Related Information

The Seven Tiers of Disaster Recovery

Backup Sites



Virtual Tape Library

Synchronous & asynchronous replication over distance

Replication storage technology

Virtual PBX/hosted phone service

Remote backup services

Continuous data protector



Recovery Point Objective (RPO) is the point in time that the restarted infrastructure will begin to become evident. Basically, RPO is the rollback that will occur as a result of the recovery. To reduce a RPO it is necessary to increase the synchronicity of data replication.

Recovery Time Objective (RTO) is the time that will pass before an infrastructure is available. In order to reduce the RTO, it is required for data to be online and available at another site.

When a critical data loss occurs, without a preventive disaster recovery plan, the only option is to salvage the data.


External links and Citations

[Recovery Whitepapers]


Cummings, E., Haag, S., & McCubbrey D. (2005). Management Information Systems for the Information Age. McGraw-Hill Ryerson Higher Education

Disaster Recovery World

Disaster (Business Week) (registered only)

The Disaster Recovery Guide

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