When VMware vSphere CBT is not available, Veeam Backup & Replication:
A.
Uses Veeam’s proprietary
B.
Sends an e-mail alert that VMware vSphere CBT is disabled
C.
Resets VMware vSphere CBT which requires to power the VM off
D.
Runs a new active full backup
In some situations, Veeam Backup & Replication cannot leverage VMware vSphere CBT, for example, if VMs run an earlier version of virtual hardware or CBT is disabled at the ESX host level. If Veeam Backup & Replication cannot leverage VMware vSphere CBT, it fails over to Veeam’s proprietary filtering mechanism. Instead of tracking changed blocks of data, Veeam Backup & Replication filters out unchanged data blocks.
https://helpcenter.veeam.com/docs/backup/vsphere/changed_block_tracking.html?ver=95
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