The machine on which you plan to install Veeam Backup & Replication does not necessarily need to be a domain member. However, if you plan to restore Microsoft Exchange items from the Veeam Backup Enterprise Manager UI, you must install Veeam Backup Enterprise Manager on the domain member server from the Microsoft Active Directory forest in which Microsoft Exchange mailboxes are located.
veeam в данный момент не умеет в бэкап VHD Set, тупо разваливаются гостевые кластера. Официальный ответ от саппорта - мы говно и ничем не можем помочь (