Welcome to Geekdom! Actually PIM Backup
is compatible w/ WM6. Look here..
http://www.dotfred.net/
Keep in mind that this only backs up your PIM data. I would recommend you getting a comprehensive backup app that will b/u your entire phone. Two good ones are SPB Backup or Resco Backup. The $25-30 price tag is minimal compared to the aggravation you'll experience if you have to hard reset and reload all of your apps.