If you have created a custom template from a cloud server and subsequently decide to delete the original cloud server, rest assured that the custom template associated with it will not be automatically deleted.
The deletion of the original cloud server does not impact the existence of the custom template. To remove the template, you will need to take a separate action. The template will only be deleted if you intentionally remove it from the "User Templates" section within the "Templates List."
In summary, the lifecycle of the custom template is independent of the cloud server from which it was derived. It remains intact until explicitly deleted from the designated templates area.