From: anton.txt@g{oogle}mail.com   
      
   I wrote   
      
   > I want to make sure that my differential backups are not   
   > useless.  One solution is to compare byte-for-byte each   
   > new diff. backup with the previous one, and delete the   
   > copy if it turn out redundant, but I wondered if there   
   > were a simpler method.   
      
   Nope -- no two differential backup files compare equal.   
      
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