NetAudit is based on the RANCID project, and allows you to automate the backing up of network device configuration files to a centralized location; Opsview Monitor, on a regular basis.
This provides you a central repository for your network device configuration files, meaning if you need quick access to them, e.g. in the event that the network device has failed and you are replacing it/a vendor engineer is on-site replacing it, then you can quickly access and send them the configuration file and have the device back up and running within minutes. If you do not have a backup, then the configuration file will have to be written by hand, meaning greater periods of outage and impact to the customer.
NetAudit works on a Host-byHost basis, and allows you to specify the vendor type (i.e. Cisco) and authentication credentials needed in order to log in and view the network devices configuration. With these details, Opsview Monitor will then periodically log in and make a copy of the configuration and store it centrally. This allows you to then compare the config files, i.e. what has changed, has someone added a setting they shouldn't have, etc.