I just updated all the hosts using the update manager and now the backup failed with
Checking the license for the source host 'xxx'
Failed to validate license for the VM "xxx".
Host with uuid "10201248-00b4-f9d9-9b22-003048f5af08" was not found
This was quite odd. First thing I tried was re-adding the VM inside the task which failed again.
Although I was able to to browse the hosts and they also showed as licensed, I had to remove the whole vCenter from the Veeam server and re-add it which obviously deleted the backup task as well etc.
What would cause this issue ? Does this mean that every time we update the hosts (which might changed the build number) we'd have to re-create every task ?