Vmware CBT and Backup.

Vmware CBT and Backup.

to make  a simple scenario . Let's say you back up VMs with Veeam  (Full backup). when the back up is completed  ,let 's say the transferred data to the backup storage is 100 Terabytes
if after the full is completed , you will decide to run the same full another time. will this backup also be 100 Terabytes or smaller, considering CBT effect ?

Thank you
jskfanAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you run a full backup again, you'll get a full backup, no need to count changed blocks because you don't want an incremental!

and the size will be the same as the last full backup!

CBT benefits incrementals

Use of CBT increases the speed and efficiency of block‑level incremental backups.

Source
https://helpcenter.veeam.com/docs/backup/vsphere/changed_block_tracking.html?ver=95

https://www.nakivo.com/blog/vmware-changed-block-tracking-works/

http://searchdatabackup.techtarget.com/tip/The-value-of-VMwares-Changed-Block-Tracking-CBT

https://campus.barracuda.com/product/backup/doc/10649959/understanding-changed-block-tracking-on-virtual-machines/

https://helpcenter.veeam.com/docs/backup/vsphere/changed_block_tracking.html?ver=95
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Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:
Always depend on your job that you created in Veeam.

First time you run a backup is always a Full Backup, the next backup will add the incremental (regardless if is reverse incremental) or if is Synthetic or not, that depends on the settings in your job). So only the changes will be added.

But running the job again and if you specifically select Full Backup (and not a normal run), then yes is a full backup and will be the same size of the previous backup.

Or you set that all backups are full backups everyday (that you can select in the job settings).
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jskfanAuthor Commented:
I did some reading and found out that CBT is related just to Incremental and differential backups
Thank you Guys.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct!
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