OK – I want you all to remember this. Never, ever throw away or delete your ‘old’ data-sets. You will need them again for something.
And always try to keep your data files scrupulously organized. Search engines only get you so far.
Yes, you’ve guessed it. The ‘old’ data I thought I was done with is gone and I need it because there’s a problem with the revised data and I need to compare the two. Honest! It seemed like a good idea at the time. There were security issues, and I didn’t want to take the data home, and blah, blah, blah.
Please, folks, let my misfortune be your lesson. Never, ever, ever delete the data!