Well, first of all, sorry for the hijack, I just didn't realize.
In regards to X system, I belive the content server doesn't need the X, at least Kovid says: "
as far as I know, the calibre content server no longer requires X to function",
see here .The disks attached to the router are easily accessible via Samba, FTP or NFS. I plan using this server only within my house even if the router's webserver can be made public.