Hey Max - Keep in mind, if you want to do a file level restore there WILL be a lot of traffic over your WAN as you pull data back from your remote site's B/C to site A. If you use Enterprise Manager to restore files with guest indexing enabled, it won't pull anything back to site A(but you have to index the VM's where FLR may be needed). If you're like me and have 250+ remote sites that backup locally(all sites have their own backup disk) and you attempt to do a restore from the Veeam B&R server, you will be waiting a while as it mounts the backup file locally to your A site. I'd prefer it work differently as my remote sites are connected via T1, but that's what I have to work with. Enterprise Manager usually works alright, but only gives you an option to restore a file in place or download locally to your own PC.
If you need to restore lots of files using the B&R server, I suggest using the "Other Guest Files (other OS)" option as that doesn't require you to use guest indexing and also doesn't have to mount the backup to your A site! Just my observations.