Automatically save a file that has been previously saved

Question

I am new to vim and was wondering if there is a way for files that have already been manually saved to be automatically saved (every few seconds). I currently make a lot of new files (for testing plugins, etc.) that I don't want to keep, and so I want this function to only apply to files I have already manually saved at least once. Thank you!

Answer 1

1. Every time you save, you add buffer number to a global set, it can be done with autocmd with BufWritePost event or custom save command.
2. Write a function to go through all the buffers that have been saved, save it again if &modified is true.
3. Add an autocmd with CursorHold event and your function.