How to save "unsaved buffer changes" in Vim on exit?

Question

vim

Hello!
I want to exit Vim with NOT saved buffers and have it restore all the changes I made the next time I log in.
For example:
- opened a file vi ~/.vimrc
- made edits, but did not save
- then opened a new buffer enewand wrote something there
- then closed Vim without saving changes to files (the first question is “ how to do this? ”)
- after a while I open Vim and I continue to edit the same buffers (the second question is “ how is this? ”)
I want to achieve the same behavior when closing and opening, as in Sublime Text, where tabs are saved and changes without saving, too.