We would like to install a second server to ensure that if the first server crash, the other takes over and execute the ESB Services and the talend jobs that were launched initially on the first server. Can you tell us how to set up this type of project and what should we deploy please?
It depends what version you are running, but I believe you can use Apache Cellar to do this even when Talend no longer support it. Cellar was used up until v6 of Talend (it may still be used, but is on its way out). The new system is briefly described here (https://help.talend.com/search/all?query=Provisioning+Service).