Your save files for Baldur's Gate 3 are stored in AppData, usually located at C:\Users\[username]\AppData. (If you're facing difficulties in finding it, access "Hidden Items" under the "View" menu of File Explorer.) The complete pathway to your Baldur's Gate 3 save files is:
C:\Users\[username]\AppData\Local\Larian Studios\Baldur's Gate 3\PlayerProfiles\Public\Savegames\Story

Please endorse :D
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