After finishing a game I prefer to keep it but generally it's a small problem if I lose it. Losing save data before finishing a game will likely lead to me giving up on it. If a game gets DLC after I've finished it then I want my save data to still be there. Keeping my save data is important for games that I play on and off over the years like Super Smash Bros. and Mario Kart.
When I finished Dragon Quest XI I accidentally deleted my save data and only realized this when I went back to play the postgame which pissed me off and never bothered with it after that.
When I finished Dragon Quest XI I accidentally deleted my save data and only realized this when I went back to play the postgame which pissed me off and never bothered with it after that.