The idea is to keep a paper backup of your contact list. On a smartphone this is really simple. Download “Contacts to PDF” on android or some similar program. In the program I would recommend you select Csv and load that converted file into LibreOffice Calc. This is because you can easily filter or remove unwanted entries in Calc. If you convert it to a PDF directly this is not possible. After you sorted the Csv file in Calc and saved it you can export it to a PDF or print it.