Create vault rules and then apply the same in the media set properties.
Follow the article below on how to create that
http://www.symantec.com/docs/HOWTO22818
http://www.symantec.com/docs/HOWTO22320
Hello,
Inc/Diff backup of Vm are supported if you have BE 2010.
Please make sure CBT (Counter block tracking is enabled on your VMs) which will read the changed block in case of inc/Diff backups.
Also make sure your ...-ctk.VMDk file is also generate...