Backups are of extreme importance in all information systems. An IT company that fails to take regular backups of important files and data is prone to IT disasters and could go out of business eventually.
Backups are used to restore the systems and affected machines to their previous status and to revert effects of related and unwanted changes in order to enable normal functionality.
Regular backup policy must be applied strictly and monitored regularly to make sure the system always stays in a healthy status.
There are many conditions and situation that can lead to destruction of files in an IT system. Flood, electricity surges and short circuit, fire, earthquake and malicious software are all some of the examples of factors that can lead to data loss and IT disasters.
There are several types of backup methods and must be chosen based on requirements and nature of the systems. These are types of backups often used:
Complete backup is method that is used to completely backup all data present. This form of data backup could be very time consuming (depending on number and size of files) and might require lots of storage space.
Incremental form of taking backup is another method and is only applied to parts of the system that have been modified since a specific date. In this method only the changes made to related machines are stored as backups. In this method much less time is spend comparing with complete backups and is more convenient, but might not be suitable for all organizations and sometimes complete backups are a necessity.
Selective backup policy is another method that is used to store specific files of the system as backups. In this method only some predefined part of the system is the target for backups.
Data backups should never be stored on local and related systems and must be stored in other machines that are used specifically for this purpose. All computers that store backup copies of files should be strictly kept at other physical locations and buildings.