Question : Copy production windows server in to a test machine

I want to be able to take a copy of a windows 2003/2008 server which is currently in production and create an exact replica which can be used for test and development. We currently run the servers on ESX platform.

Answer : Copy production windows server in to a test machine

IPSEC can add up to 52 bytes per packet of overhead, but in my opinion, it's a waste of brain cells to try to calculate your exact bandwidth requirements based on this. Whatever bandwidth you can get, the VPN overhead will be least of your worries. I would figure 6-8% overhead for encryption.