I have an old WinXP machine which has two physical hard drives in it (both NTFS, one partition per drive) and Smartware happily backs both up. But yes the original comment will relate to two active partitions, as Smartware distinguishes initially by drive (by the drive ID number iirc), and as both partitions would of course have the same one (as they’re on the same physical drive) then problems may arise.
As an aside, there are software solutions which will allow Windows to see and access (mostly read-only, but some programs offer more) EXT4 (or EXT2 or 3) drives from Windows. Examples include Linux Reader, Ex2Fsd and Ext4Explorer. I use Ex2Fsd occasionally when I’m playing with microSD cards for my Pi on my Windows netbook. Not sure if it will help with Smartware, but I mention it as you brought the topic up.
