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There seems to be no point in backing up your bind namespace database (bind won't use any backup that you make of the association between names and ip addresses), but, as ever, if you modify the configuration of a utility you will want to backup the changed config files (and, of course, you've kept a safety copy of the unmodified config file too, haven't you?).
There may or may not be a point in backing up config files if you have not modified them. My approach has tended to be, if I can put it back in its original state by plugging in a CD that I have in my possesion, I'm not that bothered (if all you have is what is on the 'net, that might change or become unavailable, so that might require a notching up of the paranoia level), but in an enterprise environment you might have to be more careful.
So, if you are happy that you don't need to back up stuff that you can restore from a CD, your question seems to reduce to "Please tell me where the files are that I have modified, so I can back them up". Oddly, I don't seem to be the best placed person to do that. If you are modifying files and you do not know what you have modified, then you may have bigger problems.
i just install bind using yum -y install bind.
what i need to do next?
Well, if you have custom domains you're going to host or do host, you configure them. Or are you asking what to do about backing it up? Like the previous member stated, if you don't have any customizations of Bind and you're only using it as a cache naming server, there's really no point in backing it up.