Most reports that you create from either the Report Creator under the client overview page under Custom Reports or a saved Custom Report, or within any grid in a Check, you can export to a spreadsheet file.
You can do this from the Export button in the banner at the top of the report (to produce a .xlsx file), or if you can’t see the export button at the top of the page you can export to a csv file by right-clicking anywhere inside the grid and choosing Export -> CSV Export.