libvirt-backup script slightly modified for Slack notifications. Modified from an original script created by @cpcwood

libvirt-backup.sh

#Slightly modified from https://cpcwood.com/code-snippets/22-backup-libvirt-domains-using-virtnbdbackup
virtnbdbackup_path=/bin/virtnbdbackup
backup_base_dir=/mnt/backups
remove_backups_older_than_months=3
domains_to_backup=(
  "domain-a"
  "domain-b"
)

for domain in "${domains_to_backup[@]}"; do
  echo "[$(date +"%T")] Backing up $domain"

  backup_dir="$backup_base_dir/$domain/$(date +"%Y-%m")"
  echo "[$(date +"%T")] Creating backup directory $backup_dir"
  mkdir -p "$backup_dir"

  echo "[$(date +"%T")] Creating backup of $domain"
  if "$virtnbdbackup_path" -l auto -d "$domain" -o "$backup_dir" ; then
    echo "[$(date +"%T")] Backup of $domain completed successfully"
  else
    echo "[$(date +"%T")] Backup of $domain failed"
    curl -X POST -H 'Content-type: application/json' --data '{"text":"Backup of '$domain' failed"}' <slack webhook here>
  fi

  echo "[$(date +"%T")] Removing backups older than $remove_backups_older_than_months months"
  old_backup_dir="${backup_base_dir:?}/${domain:?}/$(date --date="$remove_backups_older_than_months months ago" +%Y-%m)"
  echo "[$(date +"%T")] Removing $old_backup_dir is it exists"
  if [[ -d "$old_backup_dir" ]]; then
    rm -rf "$old_backup_dir"
  fi
done

echo "[$(date +"%T")] Backups completed"