Count the number of experienced professional developers who have logged in to Teh in the past 24 hours.
Add to it the number of experienced amateur developers who have logged in to Teh in the past 24 hours.
Now subtract from that the number of people who are laughing at and pitying you for thinking your crummy methodology (one we've all done but out-grown) is superior to source control.
Now take the zero and put it round your wrist to be a reminder for what you need to do next time you're about to go near any code.
(You might like to grab a biro and scribble "p.s. use the fucking dev tools" on it too.)