Partclone is a project like the well-known backup utility "Partition Image" a.k.a partimage. Partclone provide utilities to back up used blocks and design for higher compatibility of the file system using supported library like e2fslibs.
WinBtrfs is a Windows driver for the next-generation Linux filesystem Btrfs. A reimplementation from scratch, it contains no code from the Linux kernel, and should work on any version from Windows 7 onwards. It is also included as part of the free operating system ReactOS.