Thanks a lot for your detailed replies, Mike!
1.I have decided to keep my configuration where Synology backup SANs are connected to Host servers via iSCSI. I’ve created a support case with the same question for Veeam Support and here is an abstract of what they have advised:This is a great idea to connect your hosts and NAS's via iSCSI, as doing this way you are excluding any excess links in the “data chain”. For example, when you start a task to make a reserve copy, both agents (related sub-processes that are doing data move, one is started on the source of data and the other one is started on the recipient of the data creating a dot-dot connection) will be running on the same host and will communicate via RAM instead of network (or virtual network).
This explanation is for some reason is close to my heart. I think yours is great as well, but I just find that the one from the support guys is outlining the benefits more explicitly.
2.My issue was that I didn’t get that Backup Proxies servers are created automatically on the Hyper-V host server when you add those Host servers or a Hyper-V Cluster to Veeam Backup infrastructure using Managed Servers section. Thanks to your answers I have finally got this idea
thanks a lot!