I am here to offer up a new White Paper Symantec commissioned from ESG comparing single backup solutions vs mutliple solutions to handle virtual environments.
From the intro:
In early 2012, ESG’s annual spending intentions survey revealed a tie between “improve data backup and recovery” and “increased use of server virtualization” as the number-one planned priority.
The combination of those priorities is no surprise. In most IT environments, server virtualization could almost be considered commoditized: It is no longer an “if it will happen” but a “when.” However, with virtual machines proliferating and momentum shifting to private cloud architectures that create virtual machines and data sources dynamically, IT environments rediscovered that backup was a core challenge. Between the storage sprawl caused by easy virtual server provisioning and the discovery challenges of new virtual machines (VMs), virtualization does complicate traditional backup and recovery.