Veeam Backup Failure: Task failed Error: Object server not found
   I have seen this happen if the link between Veeam and the Host is failing for some reason. Of course this assumes the VM still exists on the host.  To resolve open virtual machines or Infrastructure  Expand your VMWare vSphere Host  Right Click on the Host and select Properties.  Run through Next, Next, Next so it reconnects  Retry your backup job  If it fails again follow steps above but this time re-enter the password  Run through Next, Next,… so it reconnects  Retry your backup job