Multiple incremental files backup and recovery method

Abstract

A backup method and a recovery method for multiple incremental files belong to the technical field of computers. The backup method comprises the following steps: scanning history backup and deciding whether to conduct backup or not and the backup mode; opening all index files and context files of the incremental backup and a complete backup file for reading; establishing an index network according to the index file of the multiple incremental backup; gradually reading the context of sub-blocks to a memory from the beginning to the end according to the index network; comparing with the corresponding position of the new source file when each file is read out, so as to generate new index files of the incremental backup block after block, and generate context file of new incremental backup for the unmatched part; releasing the memory occupied by a sub-block before the context of the next sub-block is read; and writing in a recovery file when each file is read out, and other procedures arethe same as the backup part. In addition, the previous work for the recovery method part only comprises scanning history backup. The invention picks up the speed of backup and recovery, saves calculation time, and reduces backup space.

Description

technical field [0001] The invention relates to a file backup method and recovery method in the technical field of computers, in particular to a backup method and recovery method of multiple incremental files. Background technique [0002] In today's informationized and networked society, computers play an extremely important role in work and life. More and more enterprises, merchants, government agencies and individuals use computers to obtain and process information, and at the same time store the most important information in the form of data files in the computer. Once a disaster occurs to these important data, it will cause an enterprise to stop functioning, and if the data is lost, an enterprise may face bankruptcy. As a result, people began to pay attention to how to ensure data integrity, and data backup is the most important solution. [0003] According to the literature search of the prior art, it is found that the Chinese patent application number 200610001299.8...

AI Technical Summary

Problems solved by technology

However, since the incremental backup method does not store the complete source file of each version, the "backed-up file of the latest version" does not directly exist, and the source file must be restored first.

This leads to, to do a backup, first to do a restore, which is a waste of time;

[0006] (2) In order to ensure the speed of recovery, each backup must be synthesized, and after the synthesis, the backup of each version will contain all the incremental backup information in history, which still wastes storage space (at the same time, the action of synthesis is also waste of computing time)

[0007] (3) If there is no synthesis, the recovery will be extremely slow. As long as there are incremental backup versions in history, how many intermediate files will be generated. As the backup versions increase, the recovery will become slower and slower

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