Obviously, one resource has changed or is corrupt. However, the message seems 
to be clear:  "Incorrect pool name specified for group, 'daily' ".

If you have resource logging enabled, you should be able to verify what might 
have changed.

+----------------------------------------------------------------------
|This was sent by carsten_reinfeld AT avus-cr DOT de via Backup Central.
|Forward SPAM to abuse AT backupcentral DOT com.
+----------------------------------------------------------------------