Hi Zahid,
I would add a few pieces of info. Although Manuel is correct that main.cf holds the bulk of the configuration, don't forget that some values may be in the othe *.cf files, e.g. types.cf (especially if you have customized some of the agent timeouts, like the monitor interval, etc).
A command you should look into is "hasnap". This command can be used to get a snapshot of your VCS configuration. It puts together a tar/zip file of your VCS config (including llt and gab config, trigger scripts, custom agents, and other things outside the *.cf files as well!)
