sudo aptitude install dd_rescue
Creating an image with DD_Rescue:
dd_rescue /dev/sdb1 image_of_sdb1.img
Copy an image with DD_Rescue via standard output to a remote server via a pipe; very useful for remote recovery:
dd_rescue /dev/sdb1 - | ssh email@example.com "cat - > /users/email_address/image_of_sdb1.img"
Compress a disk image in real-time:
dd_rescue /dev/sdb1 - | gzip > ~/image_of_sdb1.img.gzip