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Hi there and welcome
You will want to export the sheet as a file to your computer
You can export a spreadsheet in several different file formats, including Excel (.xls only), OpenOffice, PDF, Text, HTML*, and CSV. To export a spreadsheet, select File > Download as and select a file type. Then select Open or Save.
*If you save the spreadsheet as .html, the file will open in your browser. Then select File > Save As, select the location, enter a file name, and click Save.
you can then this service here to export everything from the app
It is part of Googles policy of allowing you to export all your content