Can we program Html button using JavaScript such that user can save data in the computer?

Question

When the user type something in <textarea>Some text</textarea> the user can save the text written by the user as a file in his/her computer.
https://code.sololearn.com/WYALQbhEex9Y/?ref=app

Answer 1

yes by either using cookies or back-end servers

Answer 2

the user or the server can save the file?