Final answer:
Echo checking is not a component of backup and recovery strategies; it's a method used in data communications to ensure accurate data transmission. Mirror sites, electronic vaulting, and hot sites are indeed important components for data recovery and business continuity.
Step-by-step explanation:
The subject of the question pertains to components of a backup and recovery strategy. In the context of data protection and disaster recovery planning, the elements listed serve the purpose of ensuring that an organization's data can be recovered and operations can continue after an unexpected event. However, echo checking is not a component of backup and recovery strategies. Instead, echo checking is a method used in data communication to ensure that data are transmitted correctly across a network. The other options, mirror site, electronic vaulting, and hot site, are indeed parts of a comprehensive backup and recovery strategy:
- A mirror site is an exact replica of a website or files stored on different servers so that the data can be accessed from more than one location.
- Electronic vaulting involves the transfer of data to an offsite location for protection.
- A hot site is a backup facility that is fully equipped to take over operations if the primary site becomes unusable.