http://aznutrygkgdkngahp5im4r4d6m5k73rhykfk65jy7ftvxyk2qucs6eyd.onion/blog/The_Darknet_Market_Bible.html
In that case copy the backup file to your home folder (using the file browser) and then enter the command "cp /home/amnesia/YYYY-MM-DD-backup.tbz2.gpg ./" instead of the above. Note: you can press TAB once to use the autocomplete function. That means just type the beginning of the long backup filename (e.g. "2017-") and then press TAB.