служба теневого копирования томов(A Windows Server 2003 technology that supports creation of single point-in-time shadow copies – also known as snapshots – of single or multiple volumes without impacting file server performance. Volume Shadow Copy Service also supports backups of open files; A Windows Server 2003 technology that supports creation of single point-in-time shadow copies - also known as snapshots - of single or multiple volumes without impacting file server performance. Volume Shadow Copy Service also supports backups of open files)
VSS("служба теневого копирования" - сервис от Microsoft, позволяющий подготавливать данные к копированию, не выключая машину; обеспечивает data consistency при создании резервных копий; подробнее см. на Википедии Rami88)
