Two things :osX systemusers started to complain. Logs check of the backup 
server.
Do parts of server fail? Disks perhaps?
Why not skip the dailyy routine of one a week randomly during? Prolongs 
life of server (parts)
steve has you looking up the faq has not he? Try adding bitsamplerate 
(oops! Other programme!)
but seriously do a wear and tear check of the server. Logs should indicate 
something around the time slow became an issue 

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