Complete save system idea for a good RPG:
Quicksaves are accumulating: any time the player presses Quicksave, it is stored on disk on an external location like:
C:\Documents\MyGames\Good_RPG\Savegame\quick_01.sav
then at next Quicksave-hotkey press as quick_02.sav .. 20.
The quick saved games are timestamped in the game maybe with a thumbnail of the current area where the player is and any one of them can be loaded back at any time.
If a maximum of ~20 quicksaves are reached the oldest quicksave is getting overwritten: rotating save system.
The player is also able to save game normally to a file
C:\Documents\MyGames\Good_RPG\Savegame\game_01.sav ..02...game_20.sav , etc..
The number of these savegames is unlimited.