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Uncheck "Enable Steam cloud sync" (disable) and go to \Steam\SteamApps\common\portal 2\portal2\SAVE\{STEAM_ID}\
Delete the save files from there and start the game. You should be able to start fresh again.
Create a savegame by starting a new game, play a bit (Finish a puzzle) and turn Steam cloud back on. The new save you made should be synchronized after exiting the game.