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The password is only used when you want to backup to a remote machine via the network, using the ssh protocol. You would also need that remote machine, with a suitable ssh server (like many linux boxes have for remote admin). This scenario is what these command line versions address:
ask for a password!
What it is doing is setting up a "pipeline" so that data goes:
ntfsclone gzip ssh client network ssh server remote file
But for it to work you have to have the remote machine setup right too (e.g. with linux, with the ssh daemon running).
But if at all possible I suggest you hook up two drives in parallel, and just copy from one to the other, since it sounds like you would find it easier to configure this. Then you would use the command line:
Of course you had better be sure which one is hdc1 and which one is hda1.
Not of this is particularly difficult if you are familiar with linux, but could be a time waster if you are not i'm afraid.
I'm not sure how well ntfsclone copes with filesystem errors. I have only used it on intact filesystems, to image a working, setup system for later recovery. There are other more basic commands which can literally "clone" a hard disk, errors and all, such as dd.