title: Can I just backup postgres's directory while it's running?
body: <p>I need to back up my database but I don't have enough disk space to dump it. Can I just use duplicity to perform incremental backups on the data directory? Would that corrupt the backup somehow? I don't mind a few of the latest rows missing, but I would like my backup to not be destroyed.</p>
  
  <p>Does anyone know what the case is?</p>
  
  <p>Thanks!</p>