You're welcome.
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I have never not had a backup computer (or three).
I have three or four computers that I could consider my "main" machines and a few that could be considered as "single purpose" machines. For example, I have one old laptop that just displays a digital clock screensaver. (Hey, 7" tall numbers. Clocks that big cost $80.) Another I use for streaming video.
My newest computer's almost three years old and I will need to replace one of my "main" machines by the end of 2017. That's the desktop I'm currently typing on. It's almost 6 years old and various components are dying on it. I'd also like to have USB 3.1.
Just talking backups, I do have
one of these with an additional 3tb hard drive connected to it to backup the WD. I have a duplicate of each of my main computers' system drives and I've tested those to ensure they work, except for my Lenovo Yoga 2 laptop: it takes too much work to pull out the hard drive to make an exact duplicate, so I just have a backup and I update that occasionally. I essentially use it as a tablet and no real heavy work, so I don't care that I don't have the latest backups.
If you have Windows 8 or 10, you have the ability to make something called a "Windows-to-Go" drive that you can use on any computer. However, unless you have something called a Key Management Server or only use it on one computer, you're going to find out that it'll start telling you that the license is invalid after 2 hours. It's good in a pinch, though.
Of course, being a computer tech, I have lots and lots of parts and cables. I probably have three or four power supplies lying around. Good 20 or so old hard drives and about 6 new ones. Various video cards, etc. All could work in a pinch.
Anyhow, I did mention "electrocution," earlier. The power supply has high voltage capacitors that can hold a charge for years, even if they're not connected to power. The old CRT in your CRT monitor is essentially a big capacitor and is the reason why I never bothered trying to repair a CRT: I enjoy living too much. I have replaced the capacitors in LCD/LED based monitors, but not for the power supply, just for the main circuit board.