Backup Repository
In Nagios Log Server the Backup Repository is a shared filesystem accessible to all data instances in the cluster. Daily backups are made of the previous days index and stored in the Backup Repository. All instances in the cluster must have access to the shared filesystem for backups to work successfully.

Bandwidth
A measure of how much data has been transferred in/out of or to/from a network switch, device, or server. Nagios XI can monitor bandwidth (using the switch/router wizard).

Bash
Bash is a Linux/Unix shell that is installed by default on CentOS, RHEL, and other Linux/Unix distributions. It can be used for running scripts, commands, and applications and is commonly used by system administrators for performing maintenance or obtaining system information.

Business Process
A high level concept of determining how well a certain area of a business’ operation is working (e.g. the ecommerce service). Business processes are normally dependent on sub-components / sub-systems like web servers, database servers, etc. The Nagios BPI (business process intelligence) addon allows users to monitor business processes. See Nagios Exchange.