What are the common disaster recovery backup technologies?

Common types of disaster recovery backup technologies are generally divided into three categories:

1, application level. The protection methods designed for different applications can protect the application data in detail, such as ORACLE's own DATA GUARD or RMAN. However, this kind of protection method must have a certain technical level and a deep understanding of the application, so as to protect and restore the key data, and most systems and applications cannot restore themselves.

2. System level. According to the logical partition or data file of the system, it is impossible to protect data changes in applications, such as system backup of operating system, or traditional cold backup and third-party protection tools. The advantage is that you don't need to have a deep understanding of the application, but you must have a certain level of system technology to protect and restore key applications or system data.

3. Storage level. Using storage protection mechanism to protect disk partitions, such as snapshots or mirrors, has the advantage that you don't need to have a deep understanding of the system or application, but it is not as good as the former two in protecting data integrity, ensuring availability and verifying convenience.