The primary purpose of a good disaster recovery backup project is continuous data protection. Continuous data protection (CDP) is subdivided into True CDP and Quasi-CDP (Near CDP), which is literally only one word different, but makes a big difference in the security of disaster recovery backup data.

True CDP technology is a continuous uninterrupted monitoring and backup data changes can be restored to any point in the past, is a real real-time backup, will not cause data loss. What is quasi-CDP it is easy to understand, close to continuous data protection, that is, data backup is not real-time, there is a delay, since it is delayed, then the security of the data can not be guaranteed, if the host goes down during the delayed time period, then this part of the data will be lost, and with the growth of the backup time, the delay leads to the lagging of the amount of data will become more and more so that the host goes down and leads to the loss of the The amount of data lost as a result of host downtime will be more and more. So the face of many manufacturers of their respective products CDP technology publicity, how to identify who is TCDP, who is NCDP it, the method is very simple, test, only test results are not exaggerated publicity, a few data alone is not to test whether it is TCDP, the test needs to be used in a large amount of data, for example, a batch of hundreds of thousands of inserted data, followed by the backup will be stopped, and then view the backup machine If the data is exactly the same as the production machine, then it is TCDP, while if the data is not consistent, then it is NCDP."