What Are Computer Backup Systems?

If your system's hardware or storage media fails, the Backup tool can help you protect your data from accidental loss. For example, you can use Backup to create a copy of the data on your hard drive, and then store the data to another storage device. Backup storage media can be either logical drives (such as hard disks), independent storage devices (such as removable disks), or entire disk libraries or tape libraries that are organized and controlled by autochangers. If the original data on your hard disk is accidentally deleted or overwritten, or if the data cannot be accessed due to a hard disk failure, then you can easily restore the data from an archive copy.

Backup: For

Backup can be divided into system backup and data backup.

1. System backup: refers to the loss of system files caused by disk damage or damage to the user's operating system, computer viruses or human error, which causes the computer operating system to fail to boot properly. Therefore, use system backup to store the operating system in advance Up for backup support after a breakdown.

2, data backup: refers to the user to store data including files, databases, applications, etc., for

The role of backup is for backup support and replacement use.

Backup is

More common

People invest in a fully automatic backup system to reduce maintenance workload. As long as the system is implemented, maintenance can be relaxed. Just check the status of the backup after a week or a month.

After the user implements the backup system, it is still very important to maintain the backup system. It is mainly determined by the following factors.

Because many units have a large number of IT system hosts and application systems, and each application system has corresponding management and maintenance personnel, backup is the centralized management of various application data backup tasks. Therefore, for users with more complex application systems, backups can be set up.

When selecting a product, backup

The loss of key data of the enterprise will interrupt the normal business operation of the enterprise and cause huge economic losses. To protect data, companies need to back up disaster recovery systems. However, many enterprises think that they can sit back and relax after setting up a backup system. In fact, they need to build a disaster recovery system. The relationship between data disaster recovery and data backup is mainly reflected in the following aspects:

Backup data backup basics

Data backup is the last line of defense for high availability of data, and its purpose is to quickly recover data in the event of a system data crash. Although it is also considered as a disaster recovery solution, this kind of disaster recovery capability is very limited, because the traditional backup is mainly using internal or external data tape drives for cold backup ^[6] . In the event of a disaster in the entire computer room, such as disasters such as fire, theft, and earthquake, these backup tapes are also destroyed, and the stored tape backups can not perform any disaster recovery function.

Disaster Recovery and Backup

The real data disaster tolerance is to avoid the innate shortcomings of traditional cold backup, which can comprehensively and timely restore the entire system when a disaster occurs. Disaster recovery can be divided into multiple levels according to the level of its disaster tolerance. For example, the disaster recovery system defined by the international standard SHARE 78 has seven levels: from the simplest to backup tapes only locally to storing the backup tapes in different locations. Then, to establish an off-site backup system for real-time switching of application systems, the recovery time can also be from days to hours to minutes, seconds, or zero data loss.

No matter what kind of disaster recovery plan is adopted, data backup is still the most basic. Without backup data, any disaster recovery plan is of no practical significance. But backup is not enough, and disaster recovery is also essential. For IT, disaster tolerance is to provide a computer information system that can prevent various disasters. From a technical perspective, there are two main indicators for measuring disaster recovery systems: RPO (Recovery Point Object) and RTO (Recovery Time Object), where RPO represents the amount of data allowed to be lost when a disaster occurs; and RTO represents the system recovery time.

Backup disaster recovery is not just technology

Disaster recovery is a project, not just technology. Many customers are still concerned about disaster recovery technology, and the process, specifications and specific measures of disaster recovery are not clear. It also never evaluates the feasibility of a disaster recovery plan and believes that as long as a disaster recovery plan is established, you can sit back and relax. In fact, this has great risks. Especially in some small and medium-sized enterprises, they thought that their companies spent a lot of manpower and financial resources throughout the year for data backup and disaster recovery, and as a result, no major disasters occurred in a few years, so they were relaxed. But once a disaster occurs, regret it late! This is a very good practice for foreign multinationals. Although no major disaster has occurred in a few years, backing up such tapes has hardly come in handy, but as always, Every step is done very carefully, and the feasibility of the current disaster recovery plan is evaluated and field exercises are conducted basically every month. ^[7]

Backup data disaster tolerance level

Designing a ^[4] disaster recovery backup system requires consideration of various factors, such as the amount of backup / recovery data, the distance between the application data center and the backup data center, the data transmission method, and the recovery speed required in the event of a disaster Management and investment of the backup center. According to these factors and different application scenarios, there are four common disaster recovery backup levels:

Backup local cold backup

This level of disaster recovery backup is actually the data backup mentioned above. Its disaster recovery capability is the weakest. It only backs up data locally, and the backed up data tapes are only saved locally and not sent to other places.

In this disaster recovery solution, the most commonly used device is a ^[8] tape drive. Of course, the tape drive can be manually loaded or automatically loaded according to actual needs. The former is mainly applicable to small and medium-sized enterprises with small data storage capacity.