(a program) auto-saves
"Saving" a program means keeping important information that was created. For example, when you write something in a word processor, you "save" it so that you won't lose what you wrote.
Some programs "auto-save". That means that they automatically save their information. The user doesn't need to do anything.
A: Where's the 'Save' button?
B: Don't worry. It auto-saves.
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