I'm currently running Plesk 8.3.0 on CentOS4. I have a customized my.cnf and php.ini file (an an up-to-date php/mysql installation). I also have Xcache installed. My question is, should I update? Or will I face issues with a broken xcache, and will my configuration files for PHP and MySQL get overwritten (obviuously I will back them up)? I see some users are having email issues, will I? Also, how should I update PlesK? Via the control panel? Or run a command? Thanks !