How does Amazon Redshift backup my data? How do I restore my cluster from a backup?
Amazon Redshift 如何备份数据？ 如何从备份中还原我的集群？
Amazon Redshift RA3 clusters and Amazon Redshift Serverless use Redshift Managed Storage, which always has the latest copy of the data available. DS2 and DC2 clusters mirror the data on the cluster to ensure the latest copy is available in the event of a failure. Backups are automatically created on all Redshift cluster types and retained for 24 hours, and on serverless recovery points are provided for the past 24 hours. You can also create your own backups that can be retained indefinitely. These backups can be created at any time, and the Amazon Redshift automated backups or Amazon Redshift Serverless recovery points can be converted into a user backup for longer retention. Amazon Redshift can also asynchronously replicate your snapshots or recovery points to Amazon S3 in another Region for disaster recovery. On a DS2 or DC2 cluster, free backup storage is limited to the total size of storage on the nodes in the data warehouse cluster and only applies to active data warehouse clusters. For example, if you have total data warehouse storage of 8 TB, we will provide at most 8 TB of backup storage at no additional charge. If you would like to extend your backup retention period beyond one day, you can do so using the AWS Management Console or the Amazon Redshift APIs. For more information on automated snapshots, please refer to the Amazon Redshift Management Guide. Amazon Redshift only backs up data that has changed, so most snapshots use only a small amount of your free backup storage. When you need to restore a backup, you have access to all the automated backups within your backup retention window. Once you choose a backup from which to restore, we will provision a new data warehouse cluster and restore your data to it.
Amazon Redshift RA3 集群和 Amazon Redshift 无服务器使用 Redshift 托管式存储，其中始终有可用数据的最新副本。DS2 和 DC2 集群备份了集群上的数据，以确保在发生故障时可以使用最新的副本。所有 Redshift 集群类型的备份都是自动创建的，并保留 24 小时，而在无服务器上则提供过去 24 小时的恢复点
您还可以创建自己的备份，这些备份可以无限期保留。这些备份可以在任何时候创建，Amazon Redshift 自动备份或 Amazon Redshift 无服务器恢复点可以转换为用户备份，以保留更长时间。
Amazon Redshift 还能将您的快照或恢复点异步复制到另一个区域的 Amazon S3 中以备灾难恢复之用。
在 DS2 或 DC2 集群上，免费备份存储受限于数据仓库集群中节点上的总存储大小，并仅适用于已激活的数据仓库集群。
例如，如果您有 8TB 的数据仓库总存储大小，那么我们将提供最多 8TB 的备份存储而不另外收费。如果您想将备份保留期延长超过一天，那么您可以使用 AWS 管理控制台或 Amazon Redshift API 来实现这一目的。有关自动快照的更多信息，请参阅 Amazon Redshift 管理指南。
Amazon Redshift 仅备份已更改的数据，因此大多数快照仅使用少量的免费备份存储。如果您需要还原备份，则可以在备份保留期内访问所有自动备份。您一旦选择了某个要恢复的备份，我们将配置一个新的数据仓库集群并将数据还原至此集群中。