Block and File size with librsync

hi,
      
     I am working on  librsync 0.9.6  for  backup of remote files

     Is there any size limit for backup file ?  

     what is the best blocksize to set  with respect to 
     file size to get optimum performance ?
 
                                                        Sunil
                                                       sp-soft 
  
     
          



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