================
Restoring backup
================

To restore a Nextcloud installation there are four main things you need to
restore:

#. The configuration directory
#. The data directory
#. The database
#. The theme directory

.. note:: You must have both the database and data directory. You cannot
   complete restoration unless you have both of these.

When you have completed your restoration, also make sure to run the
:ref:`maintenance:data-fingerprint <maintenance_commands_label>` command
afterwards, to ensure your sync clients can recover from the restored backup.

Restore folders
---------------

.. note:: This guide assumes that your previous backup is called
   "nextcloud-dirbkp"

Simply copy your configuration and data folder (or even your whole Nextcloud
install and data folder) to your Nextcloud environment. You could use this command::

    rsync -Aax nextcloud-dirbkp/ nextcloud/

Restore database
----------------

.. warning:: Before restoring a backup you need to make sure to delete all existing database tables.

The easiest way to do this is to drop and recreate the database.
SQLite does this automatically.

MySQL
^^^^^

MySQL is the recommended database engine. To restore MySQL::

   mysql -h [server] -u [username] -p[password] -e "DROP DATABASE nextcloud"
   mysql -h [server] -u [username] -p[password] -e "CREATE DATABASE nextcloud"

If you use UTF8 with multibyte support (e.g. for emoijs in filenames), use::

   mysql -h [server] -u [username] -p[password] -e "DROP DATABASE nextcloud"
   mysql -h [server] -u [username] -p[password] -e "CREATE DATABASE nextcloud CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci"


PostgreSQL
^^^^^^^^^^
::

    PGPASSWORD="password" psql -h [server] -U [username] -d nextcloud -c "DROP DATABASE \"nextcloud\";"
    PGPASSWORD="password" psql -h [server] -U [username] -d nextcloud -c "CREATE DATABASE \"nextcloud\";"

Restoring
---------

.. note:: This guide assumes that your previous backup is called
   "nextcloud-sqlbkp.bak"

MySQL
^^^^^

MySQL is the recommended database engine. To restore MySQL::

    mysql -h [server] -u [username] -p[password] [db_name] < nextcloud-sqlbkp.bak

SQLite
^^^^^^
::

    rm data/owncloud.db
    sqlite3 data/owncloud.db < nextcloud-sqlbkp.bak

PostgreSQL
^^^^^^^^^^
::

    PGPASSWORD="password" pg_restore -c -d nextcloud -h [server] -U [username]
    nextcloud-sqlbkp.bak
