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 ...
Changing SQL Server or database ... - Veeam Software
https://www.veeam.com/kb159205.05.2012 · To change SQL Server or database connection settings for Veeam ONE Server, you can use the Veeam ONE Settings utility. To modify settings, follow the instructions below. Provision a domain account for Veeam ONE Monitor and Veeam ONE Reporter on the new SQL Server. This can be one account or two different accounts.