ok, now and with this link I understood everything :https://helpcenter.veeam.com/backup/vsp ... arios.html
Thank you for the answers.
As I understand this, this is only a partial improvement...
As half (and first!) part of the FLR process is always generating traffic on the backup server, which is in HQ for my customer.
In fact my customer's support case creation did not work, he told me today..
But I hope he won't try again to create a case because things are clearer for me.
So now the only solution I see is to install Veeam console on each veeam proxy server at remote sites, and use it for restore.
So is there any conflict or trouble installing the Veeam remote console components on a Veeam proxy server?
Or do you think about other suggestion to improve our bandwidth usage here please? Thanks for your help.