IT glossary

3-2-1 backup rule
The 3-2-1 rule calls for three copies of your data, on two different types of storage, with one copy off-site. It reduces the risk that a single incident will destroy every copy.
Bare-metal backup
A bare-metal backup captures the entire system, including its operating system, applications, settings and data. It lets you restore a computer or server to compatible hardware or a virtual machine and can shorten recovery after a failure.
DNS
The Domain Name System (DNS) connects names such as in4byte.es to the information needed to reach a service, such as the IP address of a web server.
Hosting
Web hosting provides the server resources that make a website or online application available. A provider may also offer email, Moodle or other services. Availability, security measures and support depend on the plan.
Proactive maintenance
Proactive maintenance uses monitoring, updates and regular checks to find problems early and reduce interruptions.
Reactive maintenance
Reactive maintenance is work carried out after a fault or incident. Its purpose is to restore service as quickly as practical.