title: Why is SQL Server backup so much larger than the DB files?
body: <p>I have a SQL Server DB that is about 13Gb with a 1.6Gb log file.  When I back it up, however, it creates a 50Gb .bak file!  Why is that?</p>
  
  <p>I have read some commentary here about transaction logs, but my DB runs on my laptop and there is no DB activity during the time of the backup.  (It only takes 5 minutes).</p>
  
  <p>My backup type is Full, my recovery type is Full, and I am doing Copy-Only backups.  Any ideas?  Much appreciated!</p>
  
  <p>I am using SQL 2008 R2, Developer Edition.</p>