NetAudit is a section of the Network Analyzer product, which allows you to configure automated backups of network device's configuration files (config files) on a Host by Host basis.
The Netaudit Module provides network auditing capabilities, integrating with the RANCID network infrastructure management tool.
As per the RANCID official website:
"RANCID monitors a router's (or more generally a device's) configuration,
including software and hardware (cards, serial numbers, etc) and uses
CVS (Concurrent Version System) or Subversion to maintain history of changes. "