Simple script for backup Nextcloud data.

nextcloud_backup.sh

#!/bin/sh
set -x

NC_PATH="/var/www/nextcloud"
DST_PATH="/tmp"
DATE=$(date +"%Y%m%d")

# start maintenance
sudo -u www-data php "$NC_PATH/occ" maintenance:mode --on

# backup folder
tar -czf "$DST_PATH/nextcloud-dirbkp_$DATE.tar.gz" -C "$(dirname $NC_PATH)" "$(basename $NC_PATH)"

# backup database
sudo mysqldump --single-transaction -u[user] -p[password] [database] > "$DST_PATH/nextcloud-sqlbkp_$DATE.bak"

# stop maintenance
sudo -u www-data php "$NC_PATH/occ" maintenance:mode --off