Yes, I agree entirely. The amount of times that I've thought a particular service I've made is "reliable" because of great uptime for 2-3 years (with no changes

Yes, I agree entirely. The amount of times that I've thought a particular service I've made is "reliable" because of great uptime for 2-3 years (with no changes), that I do a small innocuous change and cause some issues really makes me remember this. The most common issues I have with long term projects are small code/config changes (#1 by a ridiculous degree), then way below is drives filling up and then way below that is actual hardware failure. Drives filling up are often the most annoying to fix as they cause very odd user facing problems. Just fixed this week an old wordpress site that I spent over 2 hours trying to fix, trying everything, before I realised the mySQL database was full. It turns out if a mysql db is full the provider revokes insert privs on the user and wp login will just go in a loop back to the login page if it can't write to the database. No errors on the UI :(.