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Method and apparatus for providing virtual machine backup

  • US 20070208918A1
  • Filed: 02/28/2007
  • Published: 09/06/2007
  • Est. Priority Date: 03/01/2006
  • Status: Abandoned Application
First Claim
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1. A method of creating a backup of a plurality of files forming a virtual machine, the method comprising the steps of:

  • a) creating a complete backup copy of the virtual machine (FULL backup) and storing the FULL backup in a separate target location;

    b) creating a block-based index map of the FULL backup, the FULL index map including a listing of block numbers and a hash value of each block; and

    c) performing a backup session after a predetermined period of time by generating updated hash values each block of data within the virtual machine, comparing the updated hash values with those stored in the FULL index map, storing changed hash values and associated block numbers in a DELTA index map and creating a DELTA backup comprising each changed block of data.

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