@Les: The 'very wrong' syntax I posted is what was auto-generated when I added 
my target directory ("/home/michael/") using the CGI. But if you're not a fan 
of the web interface, these examples are taken directly from the config.pl file:
Examples:
#    $Conf{BackupFilesOnly} = '/myFiles';
#    $Conf{BackupFilesOnly} = ['/myFiles'];     
# same as first example

All the CGI did was add some whitespace and enclose it in brackets:
$Conf{BackupFilesOnly} = {
'/home/michael/' => [
''
]
}; 

Now if the above code can't be interpreted correctly by BackupPC, then we may 
have stumbled upon the root cause. But I don't think this is the problem or 
others would be finding the same issue.

@Bowie: Thanks for breaking that down, but I don't see how this explains why my 
system is backing up everything starting at /. Your explanation appears to 
match the documentation, so it should be working as I had intended - hence my 
reason for opening this thread.

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