Architecting a vCloud Director Solution : vCloud Director Design : 7.5 Storage
   
7.5 Storage
7.5.1 Snapshots
Tenants can create one snapshot of a vApp or individual VM including its running state (memory). The following are snapshot design considerations:
Org VDC requires enough free storage capacity for the maximum size of the snapshot, which is equal to the total size of provisioned disks and memory (if a snapshot of memory is chosen as well).
Taking a snapshot has disk I/O performance impact. In time the size of snapshot grows, which must be accounted for capacity management. It is also disables network reconfiguration options on VM.
It is possible to remove ‘Create, Remove and Revert a Snapshot’ from tenant roles.