You can "dd" to make a byte-by-byte copy of the entire drive. For example, if the NTFS drive is on /dev/hda1 and you want it to be an image file, just type in...
dd if=/dev/hda1 of=/tmp/ntfs-drive.iso
...and to restore, type...
dd if=/tmp/ntfs-drive.iso of=/dev/hda1
In the first example, you can make of=/dev/hdb1 to copy it to a secondary drive or any dev resource file you choose.
Heads up though, this will take a long time since it is copying the drive and if you set "of=" to a filename, the file will be as big as the size of the drive. You can compress the file though once "dd" is complete.