Time goes by and new hardware was developed.
Some of you mentioned that the storage inside the secret server is a bit low.
I found the BananaPi wich has a lot of dual core CPU Power and 1GByte of RAM on board. And it has a
SATA connector. So I replaced the old board by a BananaPi Board and added a 1 TByte hard disk.
The operating System was replaced by OpenMedia Vault wich comes with a lot of additional plugins.
I added the Wordpress plugin so the Secret server has also a secret BLOG :-)
The temperature inside the book is very low and the server is much faster.....