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When you restore a database on an RDS instance to an existing RDS instance, the system checks whether the data can be restored from the specified backup set or to the specified point in time to prevent restoration task failures. Before you restore a database on an RDS instance to an existing RDS instance, we recommend that you manually back up the database and then use the point in time when the backup file is generated as the start time for database restoration. You can use this method to roll back data in a flexible manner in scenarios such as application upgrades or releases. When you restore a database that is unexpectedly deleted, the system checks whether data can be restored from the specified backup set or to the specified point in time. Then, the system displays a prompt based on the check result.