Para ter uma ideia de como ele está lidando com arquivos e arquivos abertos criados durante o backup da imagem, leia a cópia de sombra a> mecanismos e como eles funcionam.
De Microsoft :
The Volume Shadow Copy Service (VSS) is a set of COM interfaces that implements a framework to allow volume backups to be performed while applications on a system continue to write to the volumes.
De Wikipedia :
Shadow Copy (also known as Volume Snapshot Service, Volume Shadow Copy Service or VSS), is a technology included in Microsoft Windows that allows taking manual or automatic backup copies or snapshots of data, even if it has a lock, on a specific volume at a specific point in time over regular intervals.