% !TeX root = sxmanual.tex
\begin{tikzpicture}[auto, thick, >=stealth', shorten >=1pt]

\colorlet{s3client}{skylableblue!10}
\colorlet{sxapp}{skylableblue!20}
\colorlet{sxclient}{skylableblue!70}

\tikzstyle{sx}=[draw,circle,black,bottom color=skylableblue, node distance=6em,
top color= white, text=black,minimum width=2em]
\tikzstyle{libres3}=[draw,circle,black,bottom color=skylableblue, node distance=7em,
top color= white, text=black,minimum width=2em]
\tikzstyle{s3}=[draw,circle,black,bottom color=s3client, node distance=6em,
top color= white, text=black,minimum width=2em]
\tikzstyle{sxapp}=[draw,circle,black,bottom color=sxapp, node distance=8em, top color= white, text=black,minimum width=2em, align=center]
\tikzstyle{sxclient}=[draw,circle,black,bottom color=sxclient, node distance=8em, top color= white, text=black,minimum width=2em, align=center]


\node[sx] (sx1) {\SX node};
\node[sx] (sx2) [below left of=sx1] {\SX node};
\node[sx] (sx3) [below right of=sx2] {\SX node};
\node[sx] (sx4) [below right of=sx1] {\SX node};

\node[libres3] (libres3) [left of=sx2] {LibreS3};

\node[sxapp] (sxdrive1) [above right of=sx4] {\SX Drive\\ Android};
\node[sxapp] (sxdrive2) [right of=sx4] {\SX Drive\\ iOS};
\node[sxapp] (sxdrive3) [below right of=sx4] {\SX Drive\\ PC};

\node[sxclient] (sxtools) [below of=sx3] {sxcp, sxls\\ \ldots};
\node[sxclient] (sxadm) [below left of=sx3] {sxadm};

\node[sxapp] (sxweb) [right of=sxtools] {\SX Web};


\node[s3,text width=3em,align=center] (s3c3) [above of=libres3] {S3 client};

\node[dashed,cloud,cloud puffs=10,cloud puff arc=120, inner ysep=1em,aspect=2,color=black,
minimum height=15em, minimum width=15em] (sx)  at ($(sx2)!0.5!(sx4)$) {};

\path[every node/.style={font=\sffamily\small}]
(sx1) edge node {} (sx4)
(sx1) edge node {} (sx2)
(sx1) edge node {} (sx3)
(sx2) edge node {} (sx3)
(sx2) edge node {} (sx4)
(sx3) edge node {} (sx4)

(libres3) edge [<->] node {\SX} (sx.west)

(s3c3) edge [<->] node {S3} (libres3)

(sxdrive1) edge [<->] (sx.45)
(sxdrive2) edge [<->] (sx.east)
(sxdrive3) edge [<->] (sx.315)
(sxtools) edge [<->] (sx.270)
(sxadm) edge [<->] (sx.225)
(sxweb) edge [<->] (sx.300)

;   

\draw[] node[draw,dashed,cloud,cloud puffs=10,cloud puff arc=120,inner ysep=1em,aspect=2,color=black,
minimum height=15em,minimum width=15em] at (sx) {}; 
\end{tikzpicture}
