DNS 区域备份
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DNS 区域备份是区域文件（BIND 格式或等效格式）中所有[[dns|DNS]]记录的保存副本，可在意外删除、提供商中断或[[registrar-migration|注册商迁移]]后用于恢复或复制 DNS 配置。区域文件是纯文本导出，包含每种记录类型——A、AAAA、CNAME、MX、TXT、NS、SOA 等——及其 TTL 值。最佳实践要求将自动化、版本化的备份存储在单独的提供商账户或源代码控制存储库中，确保灾难性的 DNS 变更可以在几分钟内撤销，而无需从头手动重建。
示例
Before changing nameservers during a hosting migration, you export the full BIND zone file and commit it to Git, so you have a timestamped record of every DNS record in case the migration goes wrong.