What's the largest an Earth-like planet can be and support Earth's biosphere?

For certain reasons I decided to not set my story on Earth. However, the planet is meant to host an Earth-like biosphere (including humans, most of Earth's species (perhaps some that didn't evolve before)). Since I was working with another planet, I decided to make it as big as possible (hence the question). The lifeforms on said planet don't need to be exactly analogous to Earth (evolution could have taken different forms), but it does need to be able to support homo sapiens (with perhaps some biological adaptations to living under higher gravity (only as high as is feasible) and other differing conditions, but still the same basic makeup).

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What's the largest an Earth-like planet can be and support Earth's biosphere?

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