Well, grabbing zone files every
30 mins & reloading the name server with the new data won't be a good idea. I think the time should be increased to grab n reload once in
3 to 4 hours. This would be beneficial for the DNS server as well for the
website hostings too, just in case you need a backup of a deleted zone file or if you want to stop a bad zone from reloading, 30 mins would be very less time if the quantity is more... Just a humble suggestion...Let me know what you think on this
