What is the difference between data-level disaster recovery backup and application-level disaster recovery backup?

Data-level disaster recovery mainly focuses on data, that is, after a disaster occurs, it can ensure that the data is not destroyed. For example, in the early days, data was transferred to different places through backup to tape, or asynchronous \ synchronous data transmission between disaster recovery center and production center was realized based on network. Application-level disaster recovery is to copy the application system on the basis of data-level disaster recovery, that is, to build another set of application support system in the remote disaster recovery center, which can provide application takeover ability. The supporting system includes data backup system, backup application system and backup network. Data level disaster recovery focuses on data backup and recovery. Data-level disaster tolerance is the foundation of application-level disaster tolerance, which provides a higher level of business recovery capability than data-level disaster tolerance.