NextCloud Backup using borgbackup

This script automates backing up your NextCloud installation using borgbackup and a remote ssh-capable storage system. I suggest using rsync.net since they have great speeds and a special pricing structure for borgbackup/attic users (details here).

This script automates the following tasks:

• Optionally copies a 503 error page to your webserver so users know when your server is unavailable due to backups being performed. The 503 file is removed when the backup is completed so users can login again
• Dumps mySQL database and adds it to the backup
• Handles entering and exiting NextCloud's maintenance mode to 'lock' accounts so changes are not made during the backup process
• Allows you to specify additional files you want backed up
• Allows you to specify files/directories to exclude from your backups (e.g. previews)
• Runs 'borg prune' to make sure you are trimming old backups on your schedule
• Creates an clear, easy to parse log file so you can easily keep an eye on your backups and any errors/warnings

Environment notes

The script is designed to be easy to use but still be flexible enough to accommodate a wide range of common NextCloud setups. I have tested it with NextCloud 13 and 14 using a standard LEMP setup (Debian Stretch, NGINX, mariaDB & PHP7). The script accepts several parameters to provide it with the settings it requires to function. In addition, it reads external files for SQL and borg settings, so you don't have to weed through the script code to supply things like passwords.

Why root?

This script must be run by the root user and will exit with an error if you try running it otherwise. This is because NextCloud's OCC command (needed to put NextCloud into maintenance mode) must be run as the web-user account and only the root account can switch users without needing to stop and ask for permission/passwords.

Script parameters

You can run the script with the '-?' parameter to access the built-in help which explains the parameters. However, the following is more detailed explanation of each parameter and how to use them:

Required parameters