Ha, I know all about computers. Sometimes they go wrong. Much to R's chagrin I kept our old working bits box in the spare room wardrobe until he became sick of it taking up space, so I made space in my own wardrobe and moved it there. It is not so critical now, since he has a laptop, but I kept it as a spare in case this one breaks down. No, not if, when. I know it will one day, and I will get the old one out and it will work. You won't even notice a gap in blog posts or emails.
As I said, I know all I need to know about computers, that is they are not trustworthy, and that is why I keep the old one as a spare and I back stuffs up very often.
Not so our airlines who seem to know less about computers than I do. Australia's Virgin Airline's computerised check in system went down today and has and still is causing massive inconvenience to tens of thousands of people.
I recall writing something similar in the past about another local airline when their system went down.
Again I say, I know all about computers and if you need to stay online without interruption, you need another computer for when yours breaks down. If I was really serious I would have another internet line, connected to another phone system, connected to another isp. If millions of dollars depended on it, I would certainly do something along these lines. If the check in system went down, I would just switch over to the other back up one. It just can't be too hard.