EditPlus provides a feature that automatically saves file at a specified time interval. This auto save feature can be enabled using EditPlus Permanent settings menu.
Click on the EditPlus Document menu and select Permanent settings from the menu list
Navigate to Files Categories and this contains the option for specifying Auto save related information. Using Auto-save interval you can specify the time after which the file content needs to be automatically saved. And by ticking the check box Auto save as *.tmp file, a tmp file will be created and updated regularly at the specified auto save time interval.