Add support for VSS (windows) #340
Description
The restic backup runs. In the mean time my work is going on. Restic come to the point where it saves my Outlook archive. But Outlook is still open, restic fails.
[2Kscanned 77389 directories, 924469 files in 7:49 GiBerror for e:\home\jf\archive\outlook\archive.pst: SaveFile() chunker.Next(): read e:\home\jf\archive\outlook\archive.pst: Der Prozess kann nicht auf die Datei zugreifen, da ein anderer Prozess e