Hi Acronis Support, We have noticed this same problem on multiple servers (2003 Standard and 2003SBS) using multiple different builds of ATI Server 9.1. The problem is that occassionally (it varies, sometimes once per week, sometimes once per month) the server totally freezes during the backup process. Typically the screen is totally blank and the only way to bring it back to life is to remove the power from the server to do a hard reboot. There seems to be a similar forum thread on this at https://www.wilderssecurity.com/showthread.php?t=146431 but it goes off the topic a little. We can assure you that the freezing is a direct result of having VSS on and we are now at the point where we have disabled VSS on nearly all the servers taht we have ATI installed on (which has resolved the problem). This is something we are not happy with at all, especially seeing as the VSS functionality is one of the features we like most about ATI. The images in the attachment are the last log entries on one of these servers, after that is when the server becomes unresponsive. Please note, this has happenned on many servers using many of your builds so there must be some underlying issues with your VSS component. Can you please investigate?