Andlinux

Run Linux and Linux apps inside Windows with Andlinux. A bit like running Linux in a virtual machine, this program is kind of a merger of Windows and the Linux kernel and not an emulated PC, making it more efficient. Andlinux runs almost all Linux applications without modification, and is a complete Ubuntu Linux system running seamlessly in Windows 2000 based systems (2000, XP, 2003, Vista; 32-bit versions only).

http://www.andlinux.org/

Bacula

Bacula is a set of computer programs that permit you (or the system administrator) to manage backup, recovery, and verification of computer data across a network of computers of different kinds. In technical terms, it is a network-based backup program.

http://www.bacula.org/en/