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--- public:vmware [2019/08/16 14:42]
ronnie.chan [How does Run Direct work?]
+++ public:vmware [2019/08/16 14:47]
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+===== Backup Mode =====
+There are two backup modes available for VM backup:
+==== VDDK Backup Mode ====
+For VM on VMware host on Enterprise Standard, Enterprise and Enterprise Plus Edition, backup is performed in VDDK mode. Backup in VDDK mode produces a backup chain that consists of a full VDDK file and a set of VDDK incremental files.
+  * During the first backup, full files (*.F.vddk) are created in the backup destination.
+  * During subsequent backup, Changed Block Tracking (CBT) - a VMware [[https://kb.vmware.com/kb/1020128|native feature]] is employed, to identify disk sectors altered since the last backup.  Altered blocks are saved as incremental VDDK file (*.I.vddk) in the backup chain.
+During a subsequent backup in VDDK mode, AhsayOBM queries CBT through VADP (vSphere APIs for Data Protection) to request for transmission of all altered blocks since the last backup.
+As there is no need to stream the VM files to the Backup Client Computer for delta generation, backup in VDDK mode will greatly enhance the speed of subsequent backup.
+^ Pro      ^ Con       ^
+| Faster backup speed for subsequent backups compared to non-VDDK backup, as a result of backing up only the used size of your VM instead of the entire machine to enhance backup efficiency. This also helps with minimizing the storage size requirement and saving storage cost.    | Require paid license, i.e. VMware Essentials License for usage of vSphere API.     |
 ===== Documentation =====

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