If you work a lot with plain-text files (markdowns, office documents CSV etc.) try learning Git. It is a version control tool - it keeps timestamped versions of your documents, so if you edit something wrong, or delete a wrong file you can bring it back by “checking out” a previous version.

It’s a software development tool originally, so learning it might be daunting for a lot of folks - fear not, download a graphical Git client app and look up some tutorials.

I promise once you get the hang of it, it will be hard to imagine doing anything without it.

One of those tools I wish were more popular among people who are not into software/engineering.