It's saving the current channel in scan and every other settings like selected scan lists, including any edits you do to channels and systems so it will start up the next time looking exactly the same, except for temporary avoids. If you don't want any mistakes you may have done to be saved, then pull the power cord so it wont have time to save anything. It will then power up in the state you had it the last time you did a proper power down.
/Ubbe