根据在灾难恢复站点上保存映像的方式不同，可能还需要恢复备份。
Depending on how you chose to keep your image at the disaster recovery site, you may also need to restore a backup.
在主站点上不需要同时保留这些备份，只需多花一点儿钱通过 Internet 发送它们。
These backups don't need to be redundant at the primary site and we only pay a little more to send them over the Internet.
搜索引擎会索引你的站点并且在搜索结果中保存自己临时的备份。
Search engines will index your site and keep their own temporary copy of it for use in returning search results.
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