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Method and apparatus for backing up data before updating the data and for restoring from the backups

  • US 6,269,381 B1
  • Filed: 06/30/1998
  • Issued: 07/31/2001
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Term
First Claim
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1. A method of backing up a primary copy of a plurality of data segments at a backup time, the method comprising steps of:

  • (a) providing a backup copy of the primary copy, the backup copy corresponding to an earlier time before the backup time;

    (b) identifying which of the segments of data of the primary copy have changed since the earlier time;

    (c) forming a differential backup of the corresponding copies of the segments of the backup copy for the identified segments; and

    (d) after the step (c), updating the backup copy from the primary copy.

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