Disaster recovery encompasses the processes, policies, and procedures put in place to restore critical operations for the resumption of business. These critical operations include data access and communications. Disaster recovery spans from simple to complex.
Disaster recovery is defined by two fundamental factors:
Simple (Off-site Tape Rotation)
A simplistic disaster recover plan involves taking the latest tape backup set off-site to a secure location. In order to restore in the event of a disaster, this scenario would require a facility with servers to house the restored data/services, a server running appropriate backup software, and an attached device able to read the off-site media set. Simple disaster recovery plans can fulfill high RPO's of 24 hours and above. The RTO of such a plan is contingent on the speed of the hardware (tape, drive, backup software) and can vary significantly.
Off-site tape rotation often involves contracting third-party companies for off-site tape storage services.
Comprehensive (Off-site Replication)
As the requirements of a disaster recovery plan increase in complexity a more comprehensive solution is needed. With RPO's defined below 24 hours and RTO's defined below 8 hours (as an example) the requirements for the underlying technology increase. Features and functions such as snapshot, replication, and WAN acceleration come into play and are often a requirement in achieving aggresive disaster recovery scenarios. As the requirements increase the complexity and room for human-error increase as well. Product suite solutions providing automation to the disaster recovery infrastructure are key to minimizing human-error.
Off-site replication also provides the option to eliminate third-party contracts for off-site tape storage services.
|Storage and SAN's|
|Backup Hardware / Software|
|Virtual Tape Libraries|
|Archiving - Email and File|
|Uninterruptible Power Supplies|
|CD / DVD Duplication|