Added backup information to manual

admin_manual/maintenance/backup.rst

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+Backing Up ownCloud
+================================
+
+To backup an ownCloud installation there are three main things you need to retain:
+
+#. The config folder
+#. The data folder
+#. The database (found in the data folder for sqlite installs)
+
+To restore an ownCloud instance:
+
+#. Extract ownCloud to your webserver
+#. Copy over your config folder with your backed up config folder
+#. Copy over your data folder with your backed up data folder
+#. Import your database
+#. Update config.php of any changes to your database connection
+
+Backup Folders
+------
+
+Simply copy your config and data folder(or even your whole ownCloud install and data folder) to a place outside of your ownCloud environment.
+
+Backup Database
+------
+
+MySQL
+^^^^^
+
+MySQL is the recommended database engine. To backup MySQL:
+
+    mysqldump -u [username] -p[password] > owncloud.sql
+
+SQLite
+^^^^^
+
+    sqlite3 owncloud.db .dump > owncloud.bak
+
+PostgreSQL
+^^^^^
+
+    pg_dump owncloud > owncloud.bak