Using CA ARCserve Central Host-Based VM Backup › How to Back Up the Virtual Machine Environment › Perform Full Disk Backups Containing Only Used Block Data

Perform Full Disk Backups Containing Only Used Block Data

Retrieving used block data after performing full disk backups helps reduce the backup window and less space requirement from the backup destination.

Note: Due to VMware limitation, used blocks cannot be retrieved from virtual machines when recovery point snapshots are present. In such cases, a full disk backup is performed on the virtual machine.

After a full disk backup is submitted, perform the following steps to retrieve the used block data:

1. Delete all the snapshots that are associated with the virtual machine.
2. Log in to the CA ARCserve Central Host-Based VM Backup virtual machine.
3. Open the registry editor and locate the following key:

   HKEY_LOCAL_MACHINE\SOFTWARE\CA\CA ARCserve D2D\AFBackupDll\VM_InstanceUUID\<UUID>
   

4. Set the registry key "full disk backupForFullBackup" to 0.
5. Create or set the registry "ResetCBT" to 1.
6. Submit the backup job.