With the Version 6.6 line of Notepad++ there is a new feature called “Session snapshot & periodic backup” which periodically (by default every 7 seconds) autosaves all of your work. It was designed to make sure that you didn’t lose your work in case the power went out or your computer crashed or something along those lines. It is this feature that is autosaving unsaved documents.
It’s pretty easy to turn off, the option for it is right underneath of the regular “Remember current session for next launch” option. The option you need to turn off is located in the “Backup” section of the settings and is titled “Enable session snapshot and periodic backup”, see the screenshot below.
