@PeterJones said: Notepad++ copies the current contents of the file on disk Yes, function “Backup on save” does exactly that, it’s not suitable. I need to save the current version of an open document. I will use third-party software to save a copy of the file on external flash disk to the specified directory on the PC. Writing plugins for Notepad++ is very interesting, but there is absolutely no time for it. Thank you.