I like your idea. However, if your shutdown script is run simply as 
$Conf{DumpPostUserCmd} = 'shutdown.sh'. Would not that work with greater 
efficiency than your 'wrapper' shell script calling another shell script.

Maybe I am wrong, but the  $Conf{DumpPostUserCmd}  is run by backuppc user when 
sending commands to the host. Which ever host it is communicating with.

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