Relevance of Change Block Tracking with Backup Software
I would like to know how CBT works when we backup a VM , either using Full Backup or Incremental Backup.
for instance, in some environment the backup can be at file level ; I mean they install backup agent on the VM Machine and from the Backup software there will be just API requests sent to Vmware to get the VM prepared for Backup. ( I am not sure if the API will request a Snapshot or not, but probably it does.)
there is another type of backup: block level. there is no Backup agent installed on the remote VM. The backup software will just send an API Request to VMware and backs up the whole VM ( I am not sure if it will back up the provisioned size of the VM or just the used side of the VM)
Well, let 'say the Full backup has been done today. Does that mean the Backup has made CBT attribute turned on ? if so then let 's say I make a second full Backup what will happen to CBT attribute, will it be turned off or it stays turned on.
Any Help will be appreciated.