KB1905: Change Managed Server Name/FQDN/IP in Veeam …
https://www.veeam.com/kb190522.07.2014 · This solution should only be used to change the vCenter Server hostname if it has changed, and not the database. If the Name/FQDN/IP of the vCenter changed due to a reinstall or upgrade, and a new vCenter database was used, the Ref-IDs will have changed. Due to the changed Ref-IDs you will need to follow the documented process in www.veeam.com ...
KB2136: vCenter Migration Utility - Veeam Software
https://www.veeam.com/kb213608.06.2016 · Veeam Backup & Replication tracks Virtual Machines in its jobs by their Managed Object Reference ID (MoRef ID), which will change when a VM is moved to another vCenter, a new vCenter Database is used, or the VM is removed and re-added to vCenter inventory. Solution The Migration Tool is available here.