Update README.md

Author: damalis

README.md

@@ -4,7 +4,7 @@ If You want to build a website with Rails at short time;
 
 #### Full stack Nginx Rails:
 <p align="left"> <a href="https://rubyonrails.org/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/4223?s=200&v=4" alt="Rails" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.docker.com/" target="_blank" rel="noreferrer"> <img src="https://raw.githubusercontent.com/github/explore/80688e429a7d4ef2fca1e82350fe8e3517d3494d/topics/docker/docker.png" alt="docker" width="40" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://mariadb.org/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/5877084?s=200&v=4" alt="mariadb" height="50" width="50"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.nginx.com" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/1412239?s=200&v=4" alt="nginx" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://redis.io" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/1529926?s=200&v=4" alt="redis" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="#" target="_blank" rel="noreferrer"> <img src="https://raw.githubusercontent.com/github/explore/80688e429a7d4ef2fca1e82350fe8e3517d3494d/topics/bash/bash.png" alt="Bash" height="50" width="50" /> </a>&nbsp;&nbsp;&nbsp;
- <a href="https://www.phpmyadmin.net/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/1351977?s=200&v=4" alt="phpmyadmin" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://letsencrypt.org/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/17889013?s=200&v=4" alt="letsencrypt" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.portainer.io/?hsLang=en" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/22225832?s=200&v=4" alt="portainer" height="40" width="40"/> </a> </p>
+ <a href="https://www.phpmyadmin.net/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/1351977?s=200&v=4" alt="phpmyadmin" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://letsencrypt.org/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/17889013?s=200&v=4" alt="letsencrypt" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.portainer.io/?hsLang=en" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/22225832?s=200&v=4" alt="portainer" height="40" width="40"/> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.offen.dev/" target="_blank" rel="noreferrer"> <img src="https://avatars.githubusercontent.com/u/47735043?s=200&v=4" alt="backup" height="40" width="40"/> </a> </p>
 
 Plus, manage docker containers with Portainer.
 
@@ -16,7 +16,7 @@ Plus, manage docker containers with Portainer.
 - [phpMyAdmin](https://hub.docker.com/r/phpmyadmin/phpmyadmin/)
 - [database](https://hub.docker.com/_/mariadb)
 - [redis](https://hub.docker.com/_/redis)
-- [backup](https://hub.docker.com/r/futurice/docker-volume-backup)
+- [backup](https://hub.docker.com/r/offen/docker-volume-backup)
 
 #### For certbot (letsencrypt) certificate:
 
@@ -279,20 +279,8 @@ The first authorize screen(htpasswd;username or password) and phpmyadmin login s
 
 ### backup
 
-This will back up the all files and folders, once per day, and write it to ./backups with a filename like backup-2022-02-07T16-51-56.tar.gz 
+This will back up the all files and folders in database/dump sql and html volumes, once per day, and write it to ./backups with a filename like backup-2023-01-01T10-18-00.tar.gz
 
-#### example for crontab file on the host machine
+#### can run on a custom cron schedule
 
-##### # old docker backup folder remove
-
-```
-50 23 * * * find ${DIRECTORY_PATH}/backups/backup* -type f -mtime +1 | xargs rm
-```
-
-##### # backup exclude rails, backups folders in ${DIRECTORY_PATH}
-
-```
-00 01 * * * tar -czvf ${DIRECTORY_PATH}/backups/'backup-example.com-'$(date +"\%Y-\%m-\%dT\%H-\%M-\%S")'.tar.gz' --exclude='backups' ${DIRECTORY_PATH}
-```
-
-[CronHowto](https://help.ubuntu.com/community/CronHowto)
+```BACKUP_CRON_EXPRESSION: '20 01 * * *'``` the UTC timezone.