Under certain circumstances, VMware Changed Block Tracking (CBT) may be unavailable to Veeam Backup & Replication. What effect will a lack of CBT information have on the Veeam backup job?
A. Veeam Backup & Replication will perform a full backup automatically
B. File Level Recovery would take a longer time for this restore point
C. The backup job will fail
D. The backup job duration will increase
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https://forums.veeam.com/veeam-backup-replication-f2/resetting-cbt-necessary-if-running-active-full-t24560.html
A
Disregard the above
D is correct
In some situations, Veeam Backup & Replication cannot leverage VMware vSphere CBT, for example, if VMs run an earlier version of virtual hardware. 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.
During VM processing, Veeam Backup & Replication consolidates virtual disk content, scans through the VM image and calculates a checksum for every data block. Checksums are stored as metadata to backup files next to VM data. When incremental backup is run, Veeam Backup & Replication opens all backup files in the chain of previous full and incremental backups, reads metadata from these files and compares it with checksums calculated for a VM in its current state. If a match is found (which means the block already exists in the backup), the corresponding block is filtered out.