Thee is also the very quick, and non-technical method. It only works for things running Windows though. You simply line up all the computers, newest at the back, oldest at the front, step well back, and shoot them*
This will at the same time fix all the security holes in the programming, and will transfer the files in far better shape than the inbuilt methods. This is known as Universal Shotgun Blast, (USB).

There is an alternative, Fire-in-the-hole, which is even better, but you need a specialised cable for it, to run from the detonator.

I've not had a reason to use a third method I've heard of as yet. You build a vertical stack, old at the top, and spill coffee over it, but you only need that for Java based stuff.....