In the case of ¿Es tu mochila? the response is Sí, es mía
The statement of ¿Es tu mochila means It's your backpack
The response was Sí, es mía means Yes, it's mine
Therefore, In the case of ¿Es tu mochila? the response is Sí, es mía is correct because it affirms that the property is hers.
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