vaultwarden-backup/vaultwarden-backup.sh

#!/usr/bin/env bash

# All executed commands are printed to stdout
set -x

# Redirect stdout (and stderr to stdout) to a file
exec 1>/var/log/backup/vaultwarden-backup/vaultwarden-backup-"$(date +%F)".log 2>&1

# Abort on nonzero exit status
set -o errexit

# Abort on unbound variable
set -o nounset

# Don't hide errors within pipes
set -o pipefail

# set your API key here
key=

# set your chat id here
chat_id=

function send_message() {
  if ! [ $# -eq 0 ]; then
    curl --silent --show-error --fail --request POST "https://api.telegram.org/$key/sendMessage" --data chat_id="$chat_id" --data text="$1" --output /dev/null
  else
    echo "No argument supplied, please specify the message to send"
    exit 1
  fi
}

function backup_vaultwarden {
  # Retrieve the date in YYYY-MM-DD format and the timestamp in H-M-S format
  backup_time=$(date +%Y-%m-%d_%I-%M-%S)

  # Set the destination directory for backups
  destination_directory=/var/local/vaultwarden/backups/${backup_time}

  # Create the destination directory
  mkdir --parents "$destination_directory"

  # Save the SQLite 3 database
  if ! sqlite3 /var/lib/vaultwarden/data/db.sqlite3 ".backup $destination_directory/backup.sqlite3"; then
    send_message "[Backup] - Error during Vaultwarden backup, please log in as soon as possible and see what went wrong"
    exit 1
  fi

  send_message "[Backup] - Vaultwarden has just been backed up"
}

backup_vaultwarden