We have an old PC which is only used to run DOS. It is in a very hostile environment (engineering factory).
Firstly we would like to backup the Hard Drive ...
Secondly we would like to upgrade the PC and install the backed up data. I am not sure what version of Windows runs DOS and will need to choose a PC that can run it.
Whaletx, If you are still monitoring this post, I suggest that the easiest and probably safest way to backup the drive is to remove it and temporarily attach it to another PC. Then copy the entire drive to a folder on the other HD.
Then, do you have access to another small HD that the PC in use will recognise?
If so, great. Then you can experiment on the 2ND HD, without worrying about screwing the original up.
What is the PC used for, and what software is it running. DaveLembke gave you a list of OP system requirements. Win98SE will very likely do the job for you either in real DOS mode, or possibly out of a Windows command prompt. We can help you get it going if you need more help.
This is just a stab in the dark, but are you using the PC to communicate through the com port to an industrial machine?