I have Hard Disk Manager 2009 Professional, but since it is strictly a problem related to backup so I am posting it here instead. I have been doing regular backups and restores using HDM for the last 8 months and never had a problem. I was using the "Paragon hot processing (PHP)" as the default snapshot engine. Recently, I noticed a problem with PHP and was forced to switch to "Volume shadow Service (VSS)" as the default snapshot engine. I have done 3 restores last week, with 3 different backups and each time I encountered the following two problems. 1- Norton Internet Security 2010, disabled itself, and gave me an error message that the virus definitions were out of date. The only solution was to download the virus definitions from Norton website and update them manually. 2- Outlook 2007 lost all emails from the hotmail accounts and had to re-download them again. I have two gmail accounts and two hotmail accounts setup. My gmail accounts were fine but each time all hotmail mails were gone. Since this problem occurred only when I switched the snapshot engine from PHP to VSS, so I can hold VSS as the culprit here or perhaps the interaction between Paragon backup engine and VSS. Can someone explain what is going on here? Everyone is saying that VSS is a reliable snapshot service and should not cause these problems, but exact same problem has happened three times in a row, it can't be coincidence.