If the concern is of a mistake causing the deletion of the zone a replicated zone file will be lost just as well. To avoid this you'll need two name-servers and update each of them independently.
Keeping not too long DNS caching times would help recovery, too short and it will be a drag on the site performance so a few (6?) hours should be fine to reduce recovery time.
Keeping not too long DNS caching times would help recovery, too short and it will be a drag on the site performance so a few (6?) hours should be fine to reduce recovery time.