Auto save is a new feature that automatically saves your work at certain intervals. To create a seamless authoring experience, here’s how to set your topics to auto save every minute. This feature is disabled by default, but can be turned on from the menu.
To enable, click Edit > Preferences > Enable auto save.
Here you'll find the "Specify time interval in seconds for auto save" option, which by default is set to 60 seconds, meaning that RoboHelp will save your unsaved content every 60 seconds.