I'll give you two use cases, one for non-technical and one for technical people.

Non-technical person will copy-paste a folder of documents to make a backup before editing a file. A crude form of version control. I've seen this method lead to the consumption of hundreds of gigabytes for duplicate content, because the folders contain a lot of auxiliary data like PDFs and JPEGs.

Technical person will run npm install and get a massive node_modules directory that is almost identical to the node_modules directory in another project.