Linux Bash: MongoDB backup script

Here is a small backup script in the Bash in Linux:

#!/bin/bash

#create the date
datum=$(date --utc --date "$1" +%x)

#hello to the user with the current date
echo "Hallo" ${USER^} "heute ist der" $datum

#checking the disc space on /home/sven
echo "Frei sind auf dem Homeverzeichnis noch" 
df -h /home/sven | awk 'NR==2 {print $4}'


#creating the backup of the database: artikel in the collection Nachrichten with the current date 
echo "Backup MongoDB Collection Nachrichten"

mongoexport --db Artikel --collection Nachrichten --type=json --out=Nachrichten_$datum.json

sleep 2

#creating the backup of the database: Lander in the collection Espana with the current date
echo "Backup MongoDB Collection Espana"

mongoexport --db Laender --collection Espana --type=json --out=Espana_$datum.json

#notification that the backups were made
notify-send "Backups wurden gemacht"