Wouldn't any number of Windows imaging programs have no problem backing up a NTFS partition? With 64-bit Windows supporting UEFI boot, its all GUID partition table these days. Any modern imaging program should handle it without a problem.
Earlier versions of Bootcamp used a so-called "
Hybrid MBR" setup to accommodate old 32-bit versions of Windows (ex: XP, 7 32-bit) that didn't support GUID partition tables. I know most imaging programs won't touch them with a 10ft pole since they were afraid of breaking something.