Profits from Amazon’s cloud division jumped 69 percent last quarter, but the rest of its business fared less well.

Amazon Web Services generated an operating profit of $687 million in the three months to Dec. 31, on sales of $2.4 billion, Amazon said Thursday. That was up from $240 million in profit and sales of $1.4 billion a year earlier.

Amazon started breaking out its cloud numbers last year and it’s proved to be the most profitable part of its business. Operating margins at AWS were 29 percent last quarter, compared to 3 percent for the company as a whole.

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