From: esquel@sommarskog.se   
      
   Anton Shepelev (anton.txt@g{oogle}mail.com) writes:   
   > I still fail, however, to understand why `first_lsn' changes   
   > for each subsequent diff. backup.  It is described as the   
   > "log sequence number of the first or oldest log record in   
   > the backup set." Since the last five diff. backups were   
   > generated with respect to the same full backup, I expected   
   > them to have the same first_lsn.  Why do they not?   
   >   
      
   Because the backup itself is logged.   
      
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