# Knowledge Check

+ One DBMS in a trading company has 5 TB data. 10 GB extra data are generated everyday. The company requires the DBMS to recover within two minutes, in the case of DBMS failure, to avoid huge monetary loss. Which of the following backup and restore strategies best serve this company's requirements?
  + A. Use TiDB BR tool to conduct a full backup every Sunday, and incremental backup every evening.
  + B. Deploy a follower of the TiDB cluster, and use TiCDC to send change logs from the leading cluster to the follower.
  + C. Use Dumpling to generate logical backups, both SQL files and csv files, from time to time.

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Recovery time objective (RTO) = 2 minutes.

Assume that restoring 1 TB data needs an hour. Restoring 5 TB data takes more than 5 hours. Neither BR nor Dumpling fit this company. Choice B is correct.