Which of the following statements is NOT correct about the benefits you can gain through PolarDB?
Large storage space
Elastic scaling within minutes
When you add a read-only node in an ApsaraDB for PolarDB cluster, you only need to pay for computing resources
Millisecond-level latency in physical replication
locked backup
Lock-free backup. https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.p38356.b99.10.1bcb7338k86bX5
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