I'm planning to test offsite replication and I'm new on this product. I've still read the user guide but I'm not completely sure about the connections I need to open between all components.
My scenario will be the follow:
We have three VMvare Infrastructures.
Infrastructure one:
1 VM with Veeam Backup Server
Infrastructure two:
1 VM with Veeam Backup Proxy
Infrastructure three:
1 VM with Veeam Backup Proxy
The off-site replica will have as source host the Infrastructure two and destination host Infrastructure three.
Infrastructure one, with the Veeam Backup Server will manage all the jobs.
Until here all should be clear. Please correct me if I'm wrong.
Now would be glad if someone can confirm/answer me the following points/questions. Due Infrastructure two is not controlled by us it's better to have and ask correct settings and network communications

For now it's not important which ports are used and of course I'll prevent to use NAT solutions, also the components should connect directly each other.
1. The Veeam Backup Server should see all the Veeam Backup Proxy and vice versa?
This is a must, afayk
2. The Veeam Backup Server should see all the Virtual Centers of the three installations?
This point I'm not completely sure. If the Proxy can comunicate with their own vCenter, the Veeam Backup Server could ask the jobs via Proxy Server, no?
3. Every Veeam Backup Proxy should see each other?
Of course this is the bases for the replica. AFAYK the traffic goes trought the proxies.
4. The Veeam Backup Server should see all the ESX servers in remote locations?
This point is not completely clear... I think Veeam Backup Server should communicate with every vCenter (question 2) and via vCenter the jobs are sent to the VMware hosts...
5. The Veeam Backup Proxy must be able to communicate with their own ESX servers for which will manage the replicas?
This question as well I'm not sure. The backup should start from a source ESX and end to destination ESX via proxies, also they should communicate.
6. The Veeam Backup Proxy must be able to communicate with their own vCenter to manage replicas?
I don't know, confused

7. The Veeam Backup source Proxy should * also * be able reach the destination ESX Servers?
I don't think so. The traffic goes trought destination Proxy.
8. The Veeam Backup source Proxy should * also * be able to reach the destination vCenter?
Like point 7, I don't think so.
Maybe some/all points are for you simple, but have not found all questions on the documentation.
Thank's a lot for the help!
Simon