If you have Windows 10 upgraded from Windows 7-8 on your Mac bootcamp, you will get an error while executing Windows 7 style backup.
Volume Shadow Copy Service error: Unexpected error CreateFileW(\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy48\,0x80000000,0x00000003,…). hr = 0x80070001, Incorrect function.
Then you’ll find that this is another Bootcamp driver problem, specifically the applehfs.sys driver that allows read only access to HFS volumes. Following this tutorial, you will have the right solution. Download Sysinternals, search applehfs and unchecking. Now the backup will run correctly.