1. cp -R Documents Downloads/
2. find Downloads -type f -name "*.xls" -exec basename {} \; | tar -cvzf backup2.tar.gz -C Downloads -T -

   find Downloads/Documents -type f -not -name "*.log" -exec basename {} \; | tar -cvzf backup2.tar.gz -C Downloads/Documents -T -

   ls --ignore=*.log Downloads/Documents/ | tar -cvzf backup2.tar.gz -C Downloads/Documents -T -

   backup2.tar.gz

7. umount: /media/usb: device is busy

  lsof | grep '<mountpoint of /dev/sda1>'
  lsof | grep '/media/usb'

  PID

  kill PID
  umount /media/usb