Ah the Sinclair Spectrum, I remember it well! It was my first computer and how proud was I to make a dot appear randomly on the screen until it filled the page with white! Sinclair was a man who did not suffer fools gladly. I remember one paragraph at the front of the manual said in more words than one, if you don't understand this, you shouldn't own a spectrum!
I reached the grand age of 60 on Friday 19th Dec, so I am guessing we have a few similar aged individuals on here?
As to storing data, I have been using the Business version of Evernote for a couple of years and prior to that OneNote. I have about 20,000 Notes and keep all my customer quotations, pdf's, links to web sites, manuals, receipts etc, etc. Along with a diary system I created were I have notes about conversations with customers and suppliers going back to 2007. All available on any of my computers from any location and of course on my phone.
Best regards
Chris