I'm building a small server/nas/whatever with my Rasberry Pi 3 B. I have already some stuff set up (Deluge, Owncloud server, Kodi and Pi Hole), and I was wondering about the most efficient/smooth way to manage a library hosted in the Pi.

Right now I have a 6GB (more or less) library. Is stored on the Owncloud server, so each machine that gets connected to the owncloud server downloads the library and can access it locally. Its a slow download process, having some data redundancy is nice, but it feels a bit cumbersome process.

I've been looking a bit on the calibre-server thingy added back in the 3 version (which should be the way to go), but I've found some users complaining about performance, security and its long-term maintenance, so I'm no really sure about it.

And I don't know if there's other, third party, options. Overall, I would like something lightweight, taking into account that I have already a mariaDB installation for owncloud, that performance is paramount (And I don't want to have it running 24/7) and that I would like to run weekly/monthly backups.

So, any help/ideas on what could I do here? Thanks!