Do you have secure copies of your data? I do. James Lindsey has this warning.

I create pdfs of my books and the Internet articles I value. Saving only the links is precarious. I buy my books in paper. It’s for this reason. Too many things are disappearing these days. Things can disappear off the internet for innocent reasons too, of course. Sometimes, website are shut down for financial reasons or because the person maintaining the website doesn’t want to maintain it. But way too many documents are becoming inconvenient to persons unknown in recent years and then they are no more . . .