#!/bin/bash

mount|grep -q "/mnt/usb" || mount /dev/sda1 /mnt/usb

/etc/init.d/weewx stop 

tar czf /mnt/usb/weewx.tar.gz -C /var/lib/weewx weewx.sdb -C /etc/weewx weewx.conf

/etc/init.d/weewx start