mediocre netbox docker backup favorable over the undecided nothing that is in place

backup-netbox-docker-db.sh

#! /usr/bin/env bash
 
set -eu
 
. ../netbox-docker/env/postgres.env
_date=$(date +%Y%m%d%H%M)
backupdir=/backup/netbox
umask 177
 
# iirc this should be done by a sidecar container or something
backupfile=${backupdir}/db-${_date}
docker compose exec postgres su postgres -c '/usr/local/bin/pg_dump --dbname=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@127.0.0.1:5432/${netbox} --format c --exclude-table-data extras_cachedvalue --exclude-table-data extras_objectchange'  > ${backupfile}
# minimal test
file ${backupfile} | grep -q "PostgreSQL custom database dump" || exit 1
gzip -f -1 ${backupfile}
 
 
# Data Backup
backupfile=${backupdir}/objects-${_date}.gz
docker compose exec netbox tar -cf - --exclude=".git" --exclude="__pycache__" /opt/netbox/netbox/media /opt/netbox/netbox/reports /opt/netbox/netbox/scripts \
    | gzip -1 > ${backupfile}
# minimal test
tar -tzvf ${backupfile} opt/netbox/netbox/media/image-attachments/.gitignore | grep -q opt/netbox/netbox/media/image-attachments/.gitignore || exit 1

lasted a whole minute till i wanted to improve it.

i would normally remove the set -e and trap ERR to drop a message, just didn't need it now. YMMV
in any case, the way it is, if this errors out, you have a failed backup, no questions there. thus the validation steps.