User account credentials are not valid (krpgroup\spf_admin):
Logon failure: the user has not been granted the requested logon type at this computer.
As long as the credentials are setup properly per the admin guide: http://www.unitrends.com/getattachment/5518176a-3f96-4646-8f96-d5fffde51f40/Legacy-Recovery-Series-and-UEB-9-0-Administrators Pg. 537
You will need to go into the local securities policy on that client and add the admin credentials to the Allow logon as a batch and Allow logon as a service policies. Once you have added the Admin credentials to these 2 policies you can attempt your Full backup again.