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Backup method and apparatus allowing only replaced data to be transferred

  • US 5,987,575 A
  • Filed: 08/29/1995
  • Issued: 11/16/1999
  • Est. Priority Date: 08/29/1994
  • Status: Expired due to Fees
First Claim
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1. A data processing apparatus, comprising:

  • a storage means for storing data;

    a data update storage means for storing replacement data and update history data; and

    a data transfer means for transferring via a communication link to a data storage apparatus said replacement data and said update history data stored in said data storage means, upon a next data backup;

    said data update storage means stores a version serial number as update history data; and

    said data transfer means determines whether or not stores a version serial number of data backed up in said data storage apparatus matches the version serial number of data stored in said data update storage means, and transfers only replacement data of the same version serial number stored in said data update storage means to said data storage apparatus, upon a positive determination, andtransfers for a data backup all update data stored in said data update storage means to said data storage apparatus, upon a negative determination.

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