If you have created a slider, and would like to move it into another site, or even just would like to have a backup copy of that, then you are able to Export the slider with a built-in tool.
So at first, you need to navigate to your slider list. Then on the line of the slider you would like to export click on the arrow down button to open the small menu of that slider, and select the Export button. Then the exported slider will be automatically downloaded within seconds. You are also able to export more sliders at the same time into one file. In that case use the checkboxes for the sliders to select them, and then use the Bulk action select under the list, and choose the export.