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One argument I can see is if you're already on e.g. a small VPS and going up to the next tier is more expensive than moving your redis instance off somewhere else. Or, not specific to this but to the idea in general: moving a resque queue and workers into EC2 to handle widely-varying traffic and faster scaling than ordering more machines at a datacenter. Then redis is just a nice atomic list manager that everything already integrates with.

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