1. A system, comprising: a server computer, configured to: receive, from a client computer configured to receive, and transmit, via a network: data encoding at least one update to at least one configuration setting for a domain name in a domain name system (DNS); and an indication of an event deferring the at least one update; after receiving the data and the indication: download via the network, from at least one DNS server within the DNS, a zone file comprising the at least one configuration setting; modify the zone file using the at least one update to generate a modified zone file comprising the at least one update; determine, in accordance with the indication, whether the event has occurred; and responsive to a determination that the event has occurred, cause the at least one DNS server to modify the zone file comprising the at last one configuration setting in accordance with the modified zone file.