There are versions of Ghost you can boot from, then create an image on a network share. Google "ghostcast" to learn more. Clonezilla also has the capability of doing a clone across a network (see Clonezilla - Sever Edition
), but I have never tried that.
Hard drive prices vary greatly. A replacement PATA drive should be under $100, but they are getting harder to find since nothing new uses them.
Newegg has long been a favorite supplier of mine:
Newegg.com - Computer Hardware, Hard Drives, Internal Hard Drives, IDE Ultra ATA100 / ATA-6
Now, the following is outside the scope of cloning the working and restoring on a new hard drive on the dead system:
If these systems are mission critical, you may want to consider a RAID controller and two hard drives. This way the system is not dead if a hard drive fails. Newegg actually has a PATA RAID Controllers:
Newegg.com - Computer Hardware, Hard Drives, Controllers / RAID Cards, IDE
Going with RAID would only be a viable option if you are going to reinstall NT 4 from scratch on the problem machine. Frankly, that may be a better idea than trying to clone a VERY old installation. NT 4 is not very hard to install...just seems primitive today, especially since any modern hard drive will need to have a VERY SMALL (by today's standards) boot partition:
Installing Windows NT on a Large IDE Hard Disk
I'd probably go with two 80Gb hard drives in RAID 1 if I were going to rebuild NT 4 myself. You'll probably also need a 3.5" floppy disk to load the RAID controller driver during the Windows NT install disk boot (press F6 when prompted).