Method and system for data deduplication in cloud backup process

The invention is suitable for the field of data processing, and provides a method for data deduplication in cloud backup process. The method comprises the following steps: classifying the data to be backed up by a cloud backup client; switching the classified data to be backed up by the cloud backup client through a preset switching algorithm; storing the fingerprint information of the switched data to be backed up by the cloud backup client through a secondary database and a primary database, and sending the fingerprint information to a cloud backup server; and globally searching a local data of the cloud backup server by the cloud backup server according to the fingerprint information, and carrying out subsequent processing according to the searching result. The method provided by the invention has the advantage of improving the data deduplication efficiency.