Incremental backup method

Abstract

The invention relates to a data backup technology, in particular to a disk incremental backup technology in a computer system. An incremental backup method comprises the following steps of: adding a valid bitmap into an incremental backup program to mark a valid data memory unit; only backing up the increment of valid data during incremental backup to reduce data redundancy and improve backup efficiency; adding a monitoring bitmap into the incremental backup program to mark a data change memory unit; backing up the increment of the valid data when monitoring is valid; and backing up all validdata when the monitoring is invalid. When the program is totally normal, the incremental backup is efficiently finished, and when the monitoring program is abnormal, no loss of increment of the validdata can be also guaranteed.

Description

technical field [0001] The invention relates to a data backup technology, in particular to a disk incremental backup technology in a computer system. Background technique [0002] Data backup is an important part of data management and is of great significance to data recovery. Incremental backup is to back up all the changed data after the last backup, that is, the increment of the backup data. The current incremental data backup methods are: [0003] 1. Use real-time monitoring to track data change records and complete incremental data backup. For example, the US 6397229 patent (disclosure date: 2002.05.28) applied by IBM Corporation in the United States. [0004] The incremental backup scheme described in this patent includes a monitoring device or program, one or more storage devices, and one or more bitmaps. Each bitmap corresponds to a storage device, and each bit in the bitmap represents a storage unit on the storage device. Wherein the monitoring device or progr...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this incremental backup method is that the file system format of the storage needs to be analyzed, that is, the storage format of each file system needs to be well understood in order to extract important descriptors such as key attributes of the file. Once the storage format of the file system changes Finally, it is difficult to implement and has poor compatibility; at the same time, when the modified data is not implemented through the file system, it is impossible to judge whether the data has changed according to the file descriptor, resulting in incomplete backup data; The file descriptor information needs to be analyzed and compared during the volume backup process. Therefore, for a storage device environment with a complex file system, the amount of data analyzed and compared during the backup process is relatively large, and it takes a long time.

[0009] It can be seen that the existing incremental backup technology is either difficult to deal with data modified outside the monitoring of backup software or through non-file system methods, or it is difficult to be compatible with the development trend of each file system through file attribute comparison. Integrity is not guaranteed the best, and the performance of the backup process is relatively low

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