Borg backup script for Raspberry Pi

borg_backup.sh

#!/bin/sh

# This script is inspired by the automated backup script example from borg site.
# https://borgbackup.readthedocs.io/en/stable/quickstart.html#automating-backups

export BORG_REPO=/var/local/borgbackups/full
export BORG_PASSPHRASE='<***>'
export RSYNC_DEST="backblaze:raspberry-hass"
export TEXTFILE_COLLECTOR_DIR=/var/lib/node_exporter/textfile_collector

info() { printf "\n%s %s\n\n" "$( date )" "$*" >&2; }
trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM

info "Starting backup"
backup_started=$(date +%s)

hostname=$(hostname)

borg create --stats --verbose --show-rc \
  --exclude-caches \
  --exclude '/proc' \
  --exclude '/sys' \
  --exclude '/dev' \
  --exclude '/mnt' \
  --exclude '/media' \
  --exclude '/run' \
  --exclude '/tmp' \
  --exclude '/var/run' \
  --exclude '/var/lock' \
  --exclude '/var/lock' \
  --exclude '/var/swap' \
  --exclude '/root/.cache' \
  --exclude '/home/*/.cache/*' \
  --exclude '/var/cache/*' \
  --exclude '/root/tmp' \
  --exclude '/home/*/tmp' \
  --exclude '/var/tmp/*' \
  --exclude '/var/local/borgbackups' \
  \
  ::'{hostname}-{now}' \
  / /boot

backup_exit=$?

info "Pruning repository"

borg prune                          \
    --list                          \
    --prefix '{hostname}-'          \
    --show-rc                       \
    --keep-daily    7               \
    --keep-weekly   4               \
    --keep-monthly  6               \

prune_exit=$?

global_exit=$(( backup_exit > prune_exit ? backup_exit : prune_exit ))

if [ ${global_exit} -eq 0 ]; then
    info "Backup and Prune finished successfully"
elif [ ${global_exit} -eq 1 ]; then
    info "Backup and/or Prune finished with warnings"
else
    info "Backup and/or Prune finished with errors"
    exit ${global_exit}
fi

borg with-lock ${BORG_REPO} rclone sync -v ${BORG_REPO} ${RSYNC_DEST}
rclone_exit=$?

if [ "$rclone_exit" -ne 0 ]; then
    info "Rclone sync failed with error code $rclone_exit"
    exit $rclone_exit
fi

# Run this to export borg repository stats to prometheus.
# https://github.com/OVYA/prometheus-borg-exporter
# /root/borg_exporter.sh

backup_completed=$(date +%s)

prom_file=$TEXTFILE_COLLECTOR_DIR/backup_stats.prom
prom_file_tmp=$PROM_FILE.$$
[ -e $prom_file_tmp ] && rm -f $prom_file_tmp

cat <<EOT >> $prom_file_tmp
# TYPE host_backup_started_time gauge
host_backup_started_time{host="${hostname}"} ${backup_started}

# TYPE host_backup_completed_time gauge
host_backup_completed_time{host="${hostname}"} ${backup_completed}
EOT

mv $prom_file_tmp $prom_file

exit ${global_exit}