title: increment backup in postgresql
body: <p>Am using postgres 8.2 &amp; and i want take incremental backup using WAL Method, i just take full backup like <code>-000000010000000000000023.00000020.backup.done</code></p>
  
  <p>Suppose that once backup will done, after that there were some DML perform in my database and ait will write in a new file suppose -</p>
  
  <pre><code>/var/lib/pgsql/data/pg_xlog/00000001000000000000003E 
  </code></pre>
  
  <p>then how can restore backup after bakup file</p>
  
  <p>i just want to restore changes -suppose i take full backup today 1:00 pm &amp; there were some changes has done till 2:00 pm and after that i just want to restore that change whose has done b/w 1 to 2 pm.</p>