The invention provides a data de-duplication method of a
backup server. The data de-duplication method specifically comprises the following steps that a logical volume of a hard disk module of the
backup server is divided to form a partition which is used for temporally storing data needing to be backed up on the
server, and the partition has the data buffering function; block segmentation is carried out the buffered data in the partition, and the hash value of the buffered data is worked out with one block as a calculation unit and stored in a
database; the hash values are compared, in other words, the hash value of the new data backed up each time is compared with the existing hash value in the
database, if the hash value of the new data is the same as the existing hash value in the
database, the new data and the data in the database are repeating data, or otherwise, the new data and the data in the database are not repeating data, and the hash value of the data block is added into a hash
library. Compared with the prior art, the data de-duplication method of the
backup server has the advantages that the repeating data can be effectively deleted, the storage space is greatly saved, the storage space is saved to a certain degree, and the
operating cost of enterprises is reduced.