A data backup method and device and data recovery method and device

Abstract

The present application provides a data backup method and device, and a data restoration method and device. First, the data to be backed up is segmented to generate a subsequence set, and each element in the subsequence set is replaced by a category symbol corresponding to the category of the subsequence to which it belongs to generate a symbol. To achieve a compression of the data to be backed up, and then encode the symbolized sequence through the sequence symbols corresponding to each of the maximum frequency continuous subsequences, generate a coded sequence corresponding to the symbolized sequence, and realize the secondary compression of the data to be backed up Second compression, and then by using the corresponding relationship between the subsequence category and the representative subsequence, the corresponding relationship between the maximum frequent continuous subsequence and the sequence symbol, and the compressed coding sequence as backup data, it can effectively avoid the existing technology. The data volume of the backup data is large, which leads to the problem of low data recovery efficiency.

Description

technical field

[0001] The present application relates to the technical field of data backup, in particular to a data backup method and device, and a data recovery method and device. Background technique

[0002] With the advent of the big data era, the scale of data is getting larger and larger, and the storage and management of massive data brings certain risks. Data loss caused by disasters may lead to huge economic losses.

[0003] In the prior art, data backup is usually used for disaster prevention, so as to ensure data security through data recovery when a disaster occurs. The traditional data backup method is usually to directly perform a full backup of the data (for example: directly obtain the backup data by copying the data to be backed up).

[0004] However, when a disaster occurs in this method and the backup data is used for data recovery, usually the data volume of the backup data is large, resulting in slow data recovery and low recovery efficiency. Conten...

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