Just go to Wordpress admin-Settings-Reading and change the value in the "Blog pages show at most" to your preference.
Just go to Wordpress admin-Settings-Reading and change the value in the "Blog pages show at most" to your preference.
I backup my files manually through FTP and db through PhpMyadmin. You can use some plugin to backup your database such as WordPress › WP-DB-Backup « WordPress Plugins .
Always do backup specially before any version update be it of wordpress or the theme.