Include or exclude files

Include files

YunoHost usually already knows what needs to be backed up. However, if you have made manual changes, such as installing an app outside of the YunoHost application system, you may want to extend YunoHost's mechanism to specify other files to be backed up.

By default, if configurations tracked by YunoHost are changed, they will be backed up. On the other hand, a database or an app added by hand, changes on some configurations not tracked, will not be backed up.

You can create a backup hook and a restore hook to add data to backup. Here is an example:

/etc/yunohost/hooks.d/backup/99-conf_custom

#!/bin/bash

# Source YNH helpers
source /usr/share/yunohost/helpers

ynh_backup_dest (){
    YNH_CWD="${YNH_BACKUP_DIR%/}/$1"
    mkdir -p $YNH_CWD
    cd "$YNH_CWD"
}

# Exit hook on subcommand error or unset variable
ynh_abort_if_errors

# Openvpn
ynh_backup_dest "conf/custom/openvpn"
ynh_backup "/etc/sysctl.d/openvpn.conf"
ynh_backup "/etc/openvpn"
ynh_backup "/etc/fail2ban/jail.d/openvpn.conf"
ynh_backup "/etc/fail2ban/filter.d/openvpn.conf"

# Samba
ynh_backup_dest "conf/custom/samba"
ynh_backup "/etc/samba"
ynh_backup "/var/lib/samba"
ynh_backup "/etc/yunohost/hooks.d/post_user_create/99-samba"
ynh_backup "/etc/yunohost/hooks.d/post_user_delete/99-samba"
ynh_backup --src_path="/etc/yunohost/hooks.d/post_user_update/99-samba" --not_mandatory
ynh_backup "/etc/cron.daily/clean-trash"

# MISC
ynh_backup_dest "conf/custom/misc"
ynh_backup "/etc/sysctl.d/noipv6.conf"
ynh_backup "/usr/local/bin/"
ynh_backup "/etc/yunohost/hooks.d/backup/99-conf_custom"
ynh_backup "/etc/yunohost/hooks.d/restore/99-conf_custom"

/etc/yunohost/hooks.d/restore/99-conf_custom

#!/bin/bash

# Source YNH helpers
source /usr/share/yunohost/helpers

ynh_restore_dest (){
    YNH_CWD="${YNH_BACKUP_DIR%/}/$1"
    cd "$YNH_CWD"
}

# Exit hook on subcommand error or unset variable
ynh_abort_if_errors

# Openvpn
app="custom_openvpn" # This variable is important for the following helper
ynh_install_app_dependencies "openvpn openvpn-auth-ldap samba"

ynh_restore_dest "conf/custom/openvpn"
ynh_restore_file "/etc/sysctl.d/openvpn.conf"
ynh_restore_file "/etc/openvpn"
ynh_restore_file "/etc/fail2ban/jail.d/openvpn.conf"
ynh_restore_file "/etc/fail2ban/filter.d/openvpn.conf"

# Samba
app="custom_samba" # This variable is important for the following helper
ynh_install_app_dependencies "samba"

ynh_restore_dest "conf/custom/samba"
ynh_restore_file "/etc/samba"
ynh_restore_file "/var/lib/samba"
ynh_restore_file "/etc/yunohost/hooks.d/post_user_create/99-samba"
ynh_restore_file "/etc/yunohost/hooks.d/post_user_delete/99-samba"
ynh_restore_file --src_path="/etc/yunohost/hooks.d/post_user_update/99-samba" --not_mandatory
ynh_restore_file "/etc/cron.daily/clean-trash"
chown -R openvpn:openvpn /etc/openvpn

# MISC
ynh_restore_dest "conf/custom/misc"
ynh_restore_file "/etc/sysctl.d/noipv6.conf"
ynh_restore_file "/usr/local/bin/"
ynh_restore_file "/etc/yunohost/hooks.d/backup/99-conf_custom"
ynh_restore_file "/etc/yunohost/hooks.d/restore/99-conf_custom"

Exclude files

There is no mechanism to exclude specific files from a YunoHost backup, other than the 2 options presented below:

Avoid backing up certain /home folders

If needed, you can specify that certain user home folders not be backed up by the yunohost backup command, by creating an empty file named .nobackup inside.

Caution: this setup only works with first-level subfolders of /home, such as /home/user1 or /home/yunohost.multimedia. It does not work for other levels of subfolders, like /home/user1/bigfolder/.

Do not backup large amounts of data

Some apps like Nextcloud are potentially attached to large amounts of data. It is possible to not backup them by default. In this case, the app is said to "backup only the core" (of the app).
During an update, apps containing a large amount of data usually make a backup without these data.

To temporarily disable backup of large data, for applications that implement this feature, you can set the BACKUP_CORE_ONLY variable. To do this, the variable must be set before the backup command:

BACKUP_CORE_ONLY=1 yunohost backup create --apps nextcloud

Be careful: you will have to backup Nextcloud users' data yourself.

If you want this behavior to be permanent:

yunohost app setting nextcloud do_not_backup_data -v 1