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Product Version: 6.0
Last Modified: 31 Dec 2015


What may cause a long initial (full) VM backup?


A long initial (full) VM backup may be caused by a number of factors:

  • Large amount of data that needs to be transferred during the first backup
  • Slow or overloaded storage servers
  • Slow or overloaded network
  • Incorrect network configuration
  • Failure to enable VMware Changed Block Tracking (CBT).
    CBT helps to identify which data blocks on VM disks are not utilized (free).
    If CBT enabling fails on a VM, the product uses proprietary change tracking technology, which reads all data blocks to identify whether they are used or not.


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