To backup is to create a redundant copy, so that if anything the original is damaged, it can be recovered from the backup. The process can be as simple as copying files to diskettes.
Data backup and recovery process is very important in Information Technology area as this ensures integrity and security of data in cases of disasters, system outages, data corruption, security breaches and other threats. Without good data backup and recovery plan, any data lost because of system failures such as power, network, hardware etc cannot be recovered. In the modern computerized society, all corporate activities and operations are based on computer-based systems for which data are of main importance. All the transactions related to sales, human resource, procurement, management, inventory, customer management etc are computerized and dependent on large centralized or distributed data centers. If the data in these systems are lost, corrupted or compromised, whole operation of the organization can be hampered. If there is a well-planned data backup and recovery, the system can easily go back to the recent healthy data restoring data from backed-up archives. In case there is no data backup and disaster recovery culture, data once lost and corrupted cannot be recovered.
Disaster recovery plan is also a measure of data recovery. Disaster recovery can be done in different ways including data recovery from the archived backups or also having the actual system installed in more than one location so that if one location has problem, the services and system can be operational from the other locations. These additional system locations are also very properly called disaster recovery sites. At normal times, these sites can also share the load and in case of disasters, the operations can be shifted to the working sites. Such distributed installations are very widely used in all major data centers and other computerized information systems.