I have similar questions and want to delve further into the replication performance differences between Hyper-v 3.0 and Veeam 6.5. I see that Microsoft states that Hyper-v 3.0 replication is designed for small and medium sized business. I believe I saw one website stating a maximum of 50 vm's was recommended. Using both Hyper-v and Veeam replication, you can tune the replication intervals to a pretty granular level of, let's say, 15 minutes. But in the Veeam case, wouldn't the excessive snapshots be hard on the Hyper-v cluster? Would you want to replicate over 50 VM's on 15 minute intervals using Veeam? Wouldn't this put the Hyper-v cluster into redirected mode every 15 minutes? I know with VMWare, there is VAAI, which can help mitigate some of these performance issues. But not sure on Hyper-v. Can veeam replication on Hyper-v take advantage of Hardware VSS snapshots to help from going into redirected mode?