title: SVN Dump size confusion
body: <p>Can someone please educate me, when i run a full dump on our repo using the following command</p>
  
  <p><i> svnadmin dump /repo > backup.dump </i></p>
  
  <p>This dump file is around 90GB</p>
  
  <p>if i do a dump file with the following command on the same repo</p>
  
  <p><i> svnadmin dump /repo -r 21782:HEAD > backup.dump </i></p>
  
  <p>This dump file comes out as 152GB</p>
  
  <p>Even though i have missed out the first 20,000 revisions this is almost twice as big, how is this even possible.</p>
  
  <p>I would of thought it would have been smaller, is this something to do with compression?</p>
  
  <p>If you dump using revisions its uncompressed?</p>