Backup and Disaster Tolerance

Backup and Disaster Tolerance

BackupIt is used to cope with system data recovery and save historical data as "offline data ";

Disaster ToleranceIn the event of a system failure, the system can still provide services normally, "online data ";

Backup is concerned with data security, disaster tolerance is concerned with the security of business applications

Relationship between backup and disaster tolerance

In terms of definition, backup refers to the creation of one or more copies of important data generated by the application system to enhance data security. Therefore, the objects of backup and disaster recovery are different,Backup is concerned with data security, disaster tolerance is concerned with the security of business applicationsBackup can be called "Data Protection", while disaster recovery is called "business application protection ". Backup means that data can be copied using a tape drive or tape library through the backup software. You can also use disks and CDs as the storage media; disaster Tolerance means that two sites are connected through the high availability solution.
First of all, there is data protection in backup and disaster tolerance. Most backups adopt the tape mode, which features low performance and low cost. Disaster Tolerance uses the disk mode for data protection and data is always online with high performance, high cost; second, backup is a basis in the storage field, and a complete disaster recovery solution must include the backup part. At the same time, backup is also an effective supplement to the disaster recovery solution, because the data in the disaster recovery solution is always online, the storage may be completely damaged, and backup provides an additional line of defense, even if the online data is lost, it can be recovered from the backup data.

Backup networking

Host-base, lan-base, lan-free, and server-free

Backup Structure

D2d, d2t, d2v, d2d2t

Backup Software System Composition

Backup Software, backup devices, backup servers

Disaster recovery indicators

RTO, RPO

Disaster recovery methods

Data-level disaster tolerance, application-level disaster tolerance, and business-level disaster tolerance

Data Protection Technology

Snapshot, clone, CDP, replication (local, remote) synchronous/asynchronous

Backup and Disaster Tolerance