backup fails because of unknown folder \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy23\Users\
My backup fails because of an unknown folder \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy23\Users. How is this folder created and how can I stop it being created? The rest of the string includes a normal folder and file, but it is the root that causes the problem. I cannot add it as an exclusion as it is not recognised. If I delete the file itself then it chooses another one.