Note that Enterprise Manager 9.5 Update 4 supports version 9.5 and 9.0 backup servers, so you can potentially run both old and new product versions side by side. Are you using Veeam Backup Enterprise Manager? If yes, start the upgrade procedure from this component.Note that the built-in configuration backup functionality does not protect Enterprise Manager configuration. Perform backup of the corresponding SQL Server configuration databases used by backup and Enterprise Manager servers, so that you can easily go back to the previous version in case of issues with upgrade.Disable any periodic and backup copy jobs, so that they do not start during the upgrade. We recommend that you do not stop running jobs and let them complete successfully. Make sure there is no active processes, such as any running jobs and restore sessions.Are you using Cloud Connect? If yes, check with your Cloud Connect service provider if they have already upgraded their system to at least the version you are upgrading to.Are you using Veeam Agents operating in the standalone mode together with Veeam Backup & Replication? If yes, after you upgrade Veeam Backup & Replication to version 9.5 Update 4, you must upgrade Veeam Agent on protected computers to version 3.0 or later.We recommend Microsoft SQL Server 2014 or later for performance considerations. If yes, you must upgrade the Microsoft SQL Server to version 2008 or later first. Check if your Veeam Backup & Replication or Veeam Backup Enterprise Manager configuration database is hosted on Microsoft SQL Server 2005.
For information on how to perform the migration, see this Veeam KB article. If not, you must migrate the server to the supported OS first, before performing the upgrade.
Are you using a Perpetual per-socket license for VMs along with a license for Veeam Agents on your backup server? If yes, obtain a merged license with sockets and instances in the same file from the Veeam Customer Support Portal before upgrading.
Are you using a per-VM license for VMs or Veeam Agents on your backup server? If yes, obtain a replacement per-instance license from the Veeam Customer Support Portal before upgrading.To upgrade from previous versions, contact Veeam Customer Support. Are you running Veeam Backup & Replication 9.0 Update 2 or later? If yes, perform the upgrade procedure described below.Veeam ONE supports monitoring of backup servers versions 9.5 and 9.0. Are you using Veeam ONE to monitor your backup infrastructure? If yes, upgrade it first.Check the following prerequisites before upgrading Veeam Backup & Replication: