Simple definition
CBT follows the modified blocks of a VMware virtual disk.
Technical definition
Changed Block velance allows backup solutions to only read the modified blocks from a previous point.
What’s the point?.
accelerate the incremental backups of virtual machines.
Concrete example
a backup does not read all the VMDK after the first full.
Common problems
- C BT inconsistent.
- The problem of the new technology.
- Involuntary full fallback.
To be noted: Always adapt the diagnosis to the version of the product and to the architecture actually deployed.