Enough disk space on Client and Data Tierhttp://blogs.msdn.com/akashmaheshwari/archive/2005/12/06/500418.aspxWe have found that VSS Converter crash if the machine on which you are running converter ran out of disk space. VSS Converter requires disk space for storing intermediate data in SQL Express, some disk space for storing the log file and last but not leasten-USCommunityServer 2.1 SP1 (Build: 61025.2)