Exchange credentials on DAG

NBU 7.6.0.3

Exchange 2013 cu4

i'm not sure how to handle this error message beause DAG01 is not an actual server though the past weeks everything was running fine, this morning i got below error message:

2/01/2015 18:15:11 - Info bpbrm (pid=948) starting bpbkar on client
12/01/2015 18:15:11 - connected; connect time: 0:00:00
12/01/2015 18:15:27 - Info bpbkar (pid=14844) Backup started
12/01/2015 18:15:27 - Info bpbrm (pid=948) bptm pid: 978
12/01/2015 18:15:27 - Info bptm (pid=978) start
12/01/2015 18:15:29 - Info bpbkar (pid=14844) change time comparison:<disabled>
12/01/2015 18:15:29 - Info bpbkar (pid=14844) archive bit processing:<enabled>
12/01/2015 18:15:29 - Error bpbrm (pid=948) from client dag01: ERR - Process is running under LocalSystem account. This is not allowed for nbfsd activity. Please configure Exchange credentials in the client host properties.

regards,

Rino