Veeam proprietary changed block tracking mechanism (CBT).To keep track of changed data blocks, Veeam Backup & Replication uses the following mechanisms: Note that if you choose to run incremental jobs with CBT disabled, the backup window may increase dramatically, as Veeam Backup & Replication will read all VM data to detect what blocks have changed since the last job session. You can disable it either at the host level or at the job level for troubleshooting purposes. Veeam Backup & Replication uses CBT for the following operations: CBT increases the speed and efficiency of incremental backups. To get the list of changed data blocks, Veeam Backup & Replication uses the changed block tracking mechanism, or CBT.
When Veeam Backup & Replication performs incremental backup, it needs to know what data blocks have changed since the previous job session.
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