VM templates are excluded from backups by default.
To be able to see a template in the list of virtual infrastructure objects while editing a backup job, go to Virtual Machines > Add and open the VMs and Templates view. Search the necessary template by template name. Templates displayed in the search results list are identified as a “Template”.
When processing VM containers, Veeam Backup & Replication includes VM templates in version 6.x and higher. To exclude VM templates from being backed up, click on Exclusions and open the Templates tab and clear the “Backup VM templates” check box. The “Exclude templates from incremental backup” option allows you to include VM templates into full backups only.