Thanks a lot for all your fast answers. I am having a lot of troubles finding commercial informations about licensing. I have sent several mails but received no answer and here (italy) it is no possible to call any commercial by phone
I have some other questions:
Can I make "hot" backups too?
VMware vSphere Pricing Options
here i could not find "standard license" for Vmware. The one I found cost double the price of an essential. the one with lowest price is the essential.
What does "Required support*" mean for essentials? Do i have to buy support too? Is this to be paid only one year? Is support included in the price?
Do i have to pay something every year?
OOT:
In your experience how much does it take to make a 1 tb backup? Is compression powerfull in this case?