Configuration settings for the management server along with the corresponding proxy servers are stored in the management server Configuration Database, which is located in the C:\ProgramData\Veeam\Backup365\ConfigDB directory on the management server. Database structure is accessed and managed using ESE engine. Configuration data is periodically replicated to the proxy server(s) so that it can be consistent and stored in the proxy server Configuration Database, located in the C:\ProgramData\Veeam\Backup365\ProxyDb directory. Proxy settings are stored in the Proxy.xml file in the same folder.
When a backup job is executed on the proxy server, its session data is also stored in that proxy’s Configuration database. This information is periodically synchronized (replicated) with the management server.
Since each management server also hosts the default proxy, the corresponding database can be found on the management server at C:\ProgramData\Veeam\Backup365\ProxyDb.