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In recent update, we are told that games are planned to be saved around 1 year.
I suggest something else...
Auto-saved for up to 2 months.
Option to save indefinitely, up to 30 games max.
I play more than 1 game a day on average. Thats 365+ saved at a time. Its way less memory load and gives us what we really want, which is to see a game from when we first started LoL 3 years ago or a play-by-play of that crazy mirror mode zed match.