Additionally to CBT backups, Avamar can also leverage CBT during restores. This feature could be useful if you need to restore a VM of several hundreds of GBs: it will only recall bytes that have been modified since last backup from backup. Looking forward to see similar feature in NBU.
There is either image level (entire VMDK) or guest level (agent within guest) Which NBU can do both, among many other backup vendors.
VCB is so last year. the new vStorage API's can use Change Block tracking (CBT) so you dont have to send the entire VMDK each time. This was a VCB limitation.
I know Avamar is one great solution that takes CBT even further by deduping even the CBT blocks.
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