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The method for setting a dynamic background image in Vue is by using the :style binding to set the CSS background-image property in a computed property or a method.

Here's an example of how it can be done:

<template>
  <div :style="{ backgroundImage: `url(${imageUrl})` }"></div>
</template>

<script>
export default {
  data() {
    return {
      imageUrl: 'https://example.com/background.jpg'
    }
  }
}
</script>

In this example, we're using the :style binding to set the background image of a div element. The backgroundImage property is set dynamically using the template literal syntax and the imageUrl variable.

You can update the imageUrl data property to change the background image dynamically.