U dont have two it saves automaticly
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Save files contain your saved game progress information. you can download sonic adventure DX director's cut PC full version 100% complete save file here from my blog go to this link: http://hypershadic0.blogspot.com/2012/11/sonic-adventure-dx-pc-100-complete-save.html
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C:\Program Files (x86)\Sonic Adventure 2\resource\gd_PC\SAVEDATA
It saves by itself as long as you have a memory card inserted.
It autosaves.