A bash script to backup Raspberry Pi home to OneDrive using duplicity

duplicity_logrotate.conf

# Place this in /etc/logrotate.d/duplicity

/var/log/duplicity.log {
    maxsize 100K
    missingok
    rotate 10
    compress
    notifempty
    create 0640 pi root
}

rpi_backup.sh

#!/bin/bash
# The above shebang is useless when running as a cronjob
# To run it as a cronjob, insert the below after typing 'crontab -e':
# SHELL=/bin/bash
# PATH=/home/pi/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games                                                                                
# 0 0 * * * /home/pi/backup.sh &>> /var/log/duplicity.log
# Do not forget to remove the leading # in the previous lines
# The script should be stored in /home/pi/backup.sh
# Also the log file /var/log/duplicity.log should be writable by the user pi

cd $HOME
echo "================================================="
echo "Backing up Pi on `date`"

encryption_key=<PLACE_GPG_KEY_ID_HERE>
dest=onedrive://backups/rpi
date=`date +%d`

mode=
if [ $date = 01 ]; then
    mode=full
    echo "New month detected"
fi

echo Backing up Pi-Hole data
[ -d pihole-backups ] || mkdir pihole-backups
(
    cd pihole-backups
    # generate a tar backup using pihole admin teleporter
    pihole -a teleporter
    ls -lh
    # remove files older than 30 days
    find . -name "pi-hole-teleporter*.tar.gz" -mtime +30 -exec rm -f {} \;
)

echo Backing up PiVPN configuration
pivpn backup
ls -lh pivpnbackup/
# remove files older than 30 days
find . -name "pivpnbackup/*.tgz" -mtime +30 -exec rm -f {} \;

echo Backup up $PWD to $dest using duplicity and mode ${mode:-incremental}...
duplicity --version
duplicity $mode --encrypt-key $encryption_key $PWD $dest

echo "Cleaning backups older than 3 months"
duplicity remove-older-than 3M --force $dest

echo Done
echo