Backups TrueNAS installation configuration

backup-truenas.sh

#!/bin/bash
set -e

if [ "$#" -ne 3 ]; then
  # Example to keep 7 copies: backup-truenas.sh tnsHome /mnt/backup/server 7
  echo "Usage: ${0} StableID DestinationDir KeepCopies"
  exit 1
fi

stableId="${1}"
backupDest="${2}"
keepCopies=$3

# ===============================================================

if ! [[ $keepCopies =~ ^[0-9]+$ ]] || [[ $keepCopies -lt 1 ]]; then
  echo "ERROR: Number of kept copies should be a positive integer"
  exit 1
fi

tnVersion=$(midclt call system.info | jq -r '.version')
tnHost=$(midclt call system.info | jq -r '.hostname')
timeNow=$(date '+%Y-%m-%d-%H%m%S')
backupFilePath="${backupDest}/${stableId}_${timeNow}_${tnHost}_${tnVersion}.tgz"

echo "Backing up host \"${tnHost}\" (${tnVersion}) to ${backupDest}"
(cd /data && tar -czf "${backupFilePath}" freenas-v1.db pwenc_secret)

echo "Cleaning up old copies leaving ${keepCopies} newest ones..."
(cd "${backupDest}" && ls -tp | grep "${stableId}_*" | grep -v '/$' | tail -n +$((keepCopies+1)) | xargs -d '\n' --no-run-if-empty rm --)

echo "OK"