Hello, I did more testing and here are the results. Previously my backup hung when preparing a shadow copy. Now the same backup does not hang. So the problem is intermittent. If the problem comes back I'll try to narrow the problem down. What you might want to do is the following. Add some code so t...

Hi, I'm using Microsoft Security Essentials. Here is some new information. My original failure to backup open files was on a big backup (250GB). I ran a new test with open files (2GB). Everything worked fine. Over the next week I will try to narrow the failure by changing what I backup. Regards, Todd