Ok I found this little tidbit in some documentation:

"As mentioned, the BackupPC user created on the system when installing the RPM 
has to run Apache in order for everything to work properly with the CGIs and 
mod_perl. Go ahead and setup the appropriate values in httpd.conf. "

So BackupPC requires the user "backuppc" to run properly.  Guess this is a 
question for the Nagios folks  :(

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