Aiming at the problem of a large number of redundant identical files on the data backup server, a new file backup scheme based on index is proposed. The core of the scheme is to establish an index for the backup file in the form of a two-dimensional linked list and store only one copy of the identical file, thereby eliminating the redundancy of duplicate files and saving storage space. The scheme includes the following parts: identification of identical files, storage of files, processing of folders, file backup process and backup update. Theoretical analysis and experiments show that the scheme saves storage space compared with the traditional method, but the system load and time consumption in the backup process are increased.
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