针对Web应用程序的内置备份刀片可创建站点和数据库副本到存储的功能帐户.要了解有关此功能的更多信息，请查看以下链接.

The built in backup blade for web apps includes the ability to create copies of your site and DB to a storage account. To learn more about this feature, please check out the below link.

不幸的是，此功能不允许您在Web应用程序所在的订阅之外选择存储帐户.您需要开发脚本或程序(可能是Web作业或函数)来复制存储内容记入外部 存储帐户.

Unfortunately, this feature does not allow you to select storage accounts outside of the subscription that the web app is in. You'll need to develop a script or program, maybe a webjob or function, to copy the contents of your storage account into an external storage account.