I just tried to reload a "Save to Disk" Save and... figured it doesn't work like I thought it would.
Maybe you could rephrase that button to "Alternate Safe" or "Manual Safe"? At the moment it totally seems like a backup option of the 6 save slots above.
And I just lost all of my progress because of that. ._.' That's over 60hrs playtime and 3 OCs lost. Now I'm really sad. I really wanted to try out diffrent story lines but I will not replay everything from the start.