The easiest method I know of to do this is to install the second hard drive in the <I> CPU (it will usually have to be configured to be a slave drive, usually hardware jumpers on the drive). Re-start the <I>, stop IDOS (by typing IDOSEXIT at a command prompt), format the drive and then use XCOPY to copy the complete contents of the <I>'s original hard drive to the new hard drive. (You need to make the new hard drive bootable so check all the proper options and switches when formatting and copying.)
Once that's complete, remove the new hard drive from the CPU, configure it to be a a Master drive and store it in a safe dry place.
People have used many other methods, including "ghosting" software and parallel cables. But, because IDOS remaps interrupts this can have some serious problems.
IDOS remaps interrupts, so depending on the method you use to connect the hard drive to the <I> you may experience problems--unless you exit IDOS before initiating the procedure.
Much clearer now. The program that i use for "ghosting" any HDD is called PING or Partimage Is Not Ghost. These GREAT utility is Linux based and requires u to restart your PC - so in this case, u should be able to backup your <I> perfectly.