I’m getting the error message when making a backup of a Windows VM “Failed to enable changed block tracking [Change tracking cannot be enabled when snapshots are present]”
I cannot delete this old snapshot because I need this version of the VM. Do you know any way to make backups of the VM without snapshot so I can use here “Changed Block Tracking” again?
Solved
CBT mode issue
Best answer by MichaelCapon
Hi Marius,
I believe the enabling CBT limitation is coming from VMware, It is recommended to not have any Snaps on a VM before CBT is enabled.
Ref: Enabling or disabling Changed Block Tracking (CBT) on virtual machines (1031873) (vmware.com)
VMware also state “Do not use a single snapshot for more than 72 hours.”
As CBT cannot be enabled due to Snapshot, The Incr job will use CRC method to calculate the changes which will take longer than CBT.
If you need the data in that Snapshot, could you create a Clone from that Snapshot?
Regards,
Michael
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