The result is a Eierlegende Wolfmilchsau ie a NAS with NFS, Samba, a web server, DLNA server, etc. - which now passes without snags and problems since 3 days. I have advice on quality USB 2A power supply 11,99 and quality brands SD Card Class 10 to 12.05 but heeded ;-) - a housing got the little guy - better safe than sorry, and above all, he is handsome. (The USB keyboard and mouse and HDMI cables are included after the initial installation again in the wardrobe - the rest is done via SSH and SFTP - eg PuTTY and WinSCP)
Even for Windoze admin like me - Thanks to the ingenious guidance of surfing a breeze.
The power savings should amount to more than 94% (3.5 watts at 365T / 24 to 150 watts at 365T / 10h) - the space saving probably also ;-)
A strong buy recommendation for all "something" tech-savvy hobbyists, which are especially able to a little bit earlier or read the latest during the installation / configuration (!) - Are thus no previous knowledge - in the incredible Linux world with all its possibilities really imperative. By the way: the system runs with me under Raspbian via potty NOOBS Installation.