I am wanting to buy an external hard drive for my aging PC, I cannot afford yet a new one.
What I want to do is to be able to take everything off the PC drive "C" EXCEPT for the OS (Windows XP Pro). However, what I don't know is what files the OS uses and I obviously don't want to cock it up.
I need to do this so that I can speed up the operation of the PC.
I agree, the best thing to do is back up/image the whole drive to an external. If you really did not want to do this you could copy your "my documents" folder to the external drive. But, in the event of anything going wrong with your hard drive (you say the pc is old), I feel it would be best to image the drive so that you have the operating system, programs, and also your personal data, on the external. (FWIW, I use acronis which is a paid-for program).
The replicator will do anything you wish it to do regarding backup. I put everything i have in "My Documents" and just backup it up on the external hard drive with a click of a button once it's all set. The 1st time you run this may take sometime, but once all the data is on the external it takes no time at all to repeat the process at a later date.
I very often backup everyday because of the amount of data i move or make during the day.