I am not as familiar with it as others may be, but "DD Rescue" is one method that is free and reliable.
There is also Image for Linux. I have it but don't use it because I don't generally make backups of my Linux installs. But I do often use, and have for years, 'Boot It' and 'Image for Windows' from the same company with great success.
Some other might chime in with some other options.
8 Pro 64bit
AMD FX 8350
Asus Sabertooth 990FX R2.0
16GB G.Skill Sniper 1866MHz
OCZ Vertex 4 128GB SSD
HDD's 750GB x2/500GB/250GB
2x XFX 6870 1GB
PC P&C 750W PSU
Cooler Master HAF 932 Red LED
CM Hyper 212 EVO w/2x SickleFlow 120mm Red LED
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"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
- Albert Einstein