Clonezilla Live is a graphical utility for making copies and image backups of hard disks and other storage media. The alternate edition is built on top of Ubuntu rather Debian Linux. This USB image can be written to a USB hard drive, USB flash drive or other flash media. Boot a computer from the media to start the graphical environment.
For Windows users a tool such as Win32 Disk Imager (https://launchpad.net/win32-image-writer) or USB Image Tool (http://www.alexpage.de/usb-image-tool/download) can be used to write the image to a media device.